A Canadian university has cancelled an event on the "stifling of free speech", citing safety concerns following the violent protests in Charlottesville.

Featuring controversial speaker Faith Goldy, the event was organised by a visiting Ryerson University tutor.
But on Wednesday, the school cancelled the 22 August event because it said it could not guarantee public safety.
The clashes in the US claimed one woman's life when a car ploughed into a crowd of anti-fascists.
A spokesperson said the university was "prioritising safety" over free speech "in light of recent events".
"There is often a tension at universities resulting from our commitment to be a place for free speech and our commitment to be a place that is civil, safe, and welcoming. In light of recent events, Ryerson University is prioritising campus safety," said university spokesperson Michael Forbes in an email.
Mr Forbes said a part-time instructor had rented a room on campus to host the event, but that after conducting a standard safety review, the university decided that "Ryerson is not equipped to provide the necessary level of public safety for the event to go forward".
The event was to feature controversial speakers Faith Goldy, Jordan Peterson and Gad Saad.
Faith Goldy is a journalist and political commentator with Canada's right-wing digital news site Rebel Media. In June, Goldy broadcast a YouTube video arguing that immigration policies were contributing to a "white genocide" in Canada.
While covering Charlottesville over the weekend for Rebel Media, she appeared to sympathize with many of the ideas espoused by the protesters.
End of Twitter post  by @FaithGoldy
Since then, the Rebel's founder Ezra Levant has publically denounced the so-called "alt-right," and a number of freelance journalists with the Rebel have announced they will no longer work for the organization.
University of Toronto psychology professor Jordan Peterson has made a name for himself campaigning against Canada's new transgender rights laws.
Gad Saad is a business professor who writes about how sex differences affect the consumer and argues against political correctness.


The Night Manager star Olivia Colman said she was "gutted" she missed the chance to pick up an award in person at the Golden Globes in the US on Sunday.

The British star won best supporting actress in a series, mini-series or TV movie for her role as an intelligence officer in the BBC drama.
Colman chose not to attend as she is about to start filming a new adaptation of Murder on the Orient Express.
"It was a gamble not to go but I thought 'I bet I don't win'".
She is starring opposite Dame Judi Dench in Sir Kenneth Branagh's version of the famous Agatha Christie tale.
She said: "I can't believe I was not there but it feels like the wrong thing not being there for the first week of a new job.
"I'm playing Judi Dench's maid and I want her to be so impressed because she is my hero. I have to be good and I don't want to be that person who turns up jetlagged but now I sort of think they would have forgiven me."
Colman said she was in bed at home by 2200 on Sunday and only found out about her win when she switched her phone on at 0700.
She said: "I had all these voicemails from the director Susanne Bier saying, 'turn your phone on!' Now I'm so gutted I'm not there. It's such an enormous honour, I'm beside myself."
Colman beat fellow Brits Lena Headey (Game Of Thrones) and Thandie Newton (Westworld) as well as This Is Us actresses Chrissy Metz and Mandy Moore to her award.
The Broadchurch star said: "I looked at the list and thought 'I won't win in that group'."
Colman said she regretted she had missed the chance to celebrate with her co-stars, Tom Hiddleston and Hugh Laurie, who also won Globes.
"I bet they know how to have a good time. I was always pregnant when we were filming but I could have got wellied with them all last night."
Her award was collected for her by presenters Kristen Bell and Cuba Gooding Jr.
Colman joked: "Don't wash it! Don't polish it if they have touched it!
"I'm clearing everything off the mantelpiece, it's going right in the middle.
"Cool people put their Baftas and things in the downstairs loo but mine are on the mantelpiece."
Follow us on Facebook, on Twitter @BBCNewsEnts, or on Instagram at bbcnewsents. If you have a story suggestion email entertainment.news@bbc.co.uk.


Markets in Asia were mostly higher after the US Federal Reserve pledged to be "patient" on raising interest rates from record lows.

The Federal Reserve statement caused US stocks to climb the most since 2013.
Japan's Nikkei rallied 2.3% to close at 17,210.05 points while the broader Topix rose 1.8% to 1,376.32.
Hong Kong's Hang Seng Index closed up 246.37 points at 22,821.43 but the Shanghai Composite slipped 3.5 points to 3,057.52.
Australia's S&P/ASX200 index rose nearly 1% to close at 5,210.80 points, led by mining and energy stocks.
Japan's Sony was one of the big stock movers of the morning.
Its shares rose by 3.5% in Tokyo trading after its entertainment unit cancelled the release of "The Interview" following a cyber-security attack, which US investigators reportedly believes stemmed from North Korea.
The comedy movie is about plans to assassinate North Korean leader Kim Jong Un.
Hackers incensed by the film leaked Sony documents and had threatened attacks on cinemas planning to show the film.
In South Korea, the Samsung Group's Cheil Industries made a strong trading debut, rising 6.6%, after pricing its initial public offering at the top end of the range.
Cheil operates theme parks and fashion outlets in the country and saw its shares double, outperforming the benchmark Kospi index which closed down 2.66 points at 1,897.50.


The company building one of the world's largest offshore wind farms will invest £15m in community and environmental projects, it has said.

Danish firm Dong Energy intends to add 90 turbines to the existing 102 at the Walney facility off the Cumbria coast.
Of an annual £600,000 fund, £100,000 will be ring-fenced to support engineering training.
The money recognised local co-operation on which the company relies, it said.
"We believe it is important to support local communities in the areas around our developments," UK chairman Brent Cheshire said.
The Walney Extension had a "long-term relationship" with the region, he added.
The expanded wind farm, which is one of four in the area, is expected to be fully commissioned by 2019 when it will be the world's largest, Dong said.
Covering about 55 sq miles (145 sq km) it will be capable of supplying energy to more than 500,000 homes.
Dong said the new fund would last for the 25-year life of the project.


People have been warned not to approach a "dangerous" convicted murderer who breached his prison release licence.

William Kerr, 53, is wanted by police after he absconded from a bail hostel in Hull following his release on 23 January.
He was jailed for life for murder at Leeds Crown Court in June 1998.
North Yorkshire Police said Kerr was known to have links to the Humberside Police force area, as well as West Yorkshire and London.
A spokesperson for the force said his current whereabouts were unknown and he needed to be arrested and returned to prison "as a matter of urgency".
Police issued a recent photo of Kerr and urged people to "keep an eye out for him".
Det Insp Eamonn Clarke said: "We ask that you do not approach Kerr, as he is considered dangerous. You should contact the police straight away on 999 and officers will be despatched to arrest him or investigate the sighting."
Det Insp Clarke also urged Kerr "to do the right thing and hand yourself in to the police".
North Yorkshire Police said it was leading the hunt for Kerr as his probation officer was based in Selby but there was "no evidence at this time to suggest that he is currently in North Yorkshire".


Newcastle United missed three spot-kicks as Hull City beat the Championship leaders 3-1 on penalties to reach the EFL Cup semi-final.

Hull keeper Eldin Jakupovic saved two penalties after the hosts had played the whole of extra time with 10 men following Dieumerci Mbokani's dismissal.
Newcastle had taken the lead in extra time when Mohamed Diame prodded home Vurnon Anita's cross to score against his former club.
The lead lasted a minute, Robert Snodgrass equalising after Matz Sels had spilled Markus Henriksen's shot into his path.
Mbokani was sent off in the 89th minute for lunging forward with his head at Jamaal Lascelles.
The tie only came to life in extra time, the first 90 minutes featuring just two shots on target.
Newcastle have now lost nine of their 10 penalty shootouts in all competitions, yet Rafael Benitez's side will be wondering why they did not win the tie in 120 minutes.
They had 32 shots in that time, but their finishing was as wayward as their penalties.
Jonjo Shelvey set the tone for Newcastle's spot-kick nightmare when his attempt was kept out by Jakupovic.
Hull's first penalty fell to Snodgrass and he made no mistake, before Dwight Gayle hit the bar with his attempt for Newcastle.
Skipper Michael Dawson made it 2-0 before Christian Atsu scored for Newcastle.
Tom Huddlestone made it 3-1, and Hull's players and fans were celebrating a first EFL Cup semi-final appearance when Jakupovic kept out Yoan Gouffran's tame attempt.
Hull had just one shot on target in normal time, and their hopes of reaching the semi-finals looked over when Mbokani was sent off.
The forward, on loan from Dynamo Kiev, kicked out and pushed Lascelles before lunging forward at the Newcastle defender with his head.
The 31-year-old has appeared in five league games since arriving at the end of August.
He now faces a three-match ban - something Hull could do without as they look to climb away from the Premier League relegation zone.
Hull City boss Mike Phelan: "This is the furthest the club has ever been and the players are really pleased.
"For this football club, it's a tremendous achievement. Hopefully we can go one step further now."
Newcastle manager Rafael Benitez: "The way that we played we deserved to score goals in the first half and in extra time. Then when we did score the goal we didn't manage the situation.
"It's something you learn with experience. Maybe we will do a little better the next time we have this many chances."
Newcastle have little time to dust themselves down. The Magpies return to Championship action on Friday away to Nottingham Forest (19:45 GMT). Middlesbrough await Hull in the Premier League at the Riverside next Monday (20:00 GMT).
Match ends, Hull City 1(3), Newcastle United 1(1).
Penalty Shootout ends, Hull City 1(3), Newcastle United 1(1).
Penalty saved! Yoan Gouffran (Newcastle United) fails to capitalise on this great opportunity,  right footed shot saved  in the bottom left corner.
Goal!  Hull City 1(3), Newcastle United 1(1). Tom Huddlestone (Hull City) converts the penalty with a right footed shot to the bottom left corner.
Goal!  Hull City 1(2), Newcastle United 1(1). Christian Atsu (Newcastle United) converts the penalty with a left footed shot to the high centre of the goal.
Goal!  Hull City 1(2), Newcastle United 1. Michael Dawson (Hull City) converts the penalty with a right footed shot to the bottom left corner.
Penalty missed! Still  Hull City 1(1), Newcastle United 1. Dwight Gayle (Newcastle United) hits the bar with a right footed shot.
Goal!  Hull City 1(1), Newcastle United 1. Robert Snodgrass (Hull City) converts the penalty with a left footed shot to the top right corner.
Penalty saved! Jonjo Shelvey (Newcastle United) fails to capitalise on this great opportunity,  right footed shot saved  in the bottom right corner.
Penalty Shootout begins Hull City 1, Newcastle United 1.
Second Half Extra Time ends, Hull City 1, Newcastle United 1.
Attempt missed. DeAndre Yedlin (Newcastle United) right footed shot from the right side of the box is too high.
Attempt blocked. Yoan Gouffran (Newcastle United) left footed shot from the centre of the box is blocked. Assisted by Jamaal Lascelles.
Attempt blocked. Mohamed Diamé (Newcastle United) right footed shot from outside the box is blocked.
Attempt missed. Dwight Gayle (Newcastle United) right footed shot from the centre of the box is too high. Assisted by Christian Atsu with a headed pass.
Attempt missed. Achraf Lazaar (Newcastle United) left footed shot from outside the box is just a bit too high. Assisted by Jonjo Shelvey following a corner.
Corner,  Newcastle United. Conceded by Michael Dawson.
Corner,  Newcastle United. Conceded by Josh Tymon.
Attempt missed. Markus Henriksen (Hull City) right footed shot from the left side of the box is just a bit too high. Assisted by Adama Diomande following a set piece situation.
Attempt missed. David Meyler (Hull City) right footed shot from the right side of the box misses to the left following a set piece situation.
Foul by Mohamed Diamé (Newcastle United).
Adama Diomande (Hull City) wins a free kick on the left wing.
Attempt missed. Dwight Gayle (Newcastle United) left footed shot from the centre of the box is high and wide to the left. Assisted by Christian Atsu.
Substitution, Newcastle United. DeAndre Yedlin replaces Vurnon Anita.
Corner,  Newcastle United. Conceded by Michael Dawson.
Attempt blocked. Yoan Gouffran (Newcastle United) left footed shot from the centre of the box is blocked.
Attempt blocked. Jamaal Lascelles (Newcastle United) header from the centre of the box is blocked. Assisted by Jonjo Shelvey with a cross.
Corner,  Newcastle United. Conceded by Josh Tymon.
Attempt saved. Dwight Gayle (Newcastle United) header from the centre of the box is saved in the top centre of the goal. Assisted by Christian Atsu with a cross.
Second Half Extra Time begins Hull City 1, Newcastle United 1.
Substitution, Newcastle United. Daryl Murphy replaces Isaac Hayden.
First Half Extra Time ends, Hull City 1, Newcastle United 1.
Attempt missed. Josh Tymon (Hull City) right footed shot from outside the box misses to the left. Assisted by Robert Snodgrass.
Foul by Ciaran Clark (Newcastle United).
Michael Dawson (Hull City) wins a free kick in the defensive half.
Attempt blocked. Yoan Gouffran (Newcastle United) left footed shot from the centre of the box is blocked.
Attempt blocked. Isaac Hayden (Newcastle United) right footed shot from outside the box is blocked.
Corner,  Newcastle United. Conceded by David Meyler.
Attempt missed. Jonjo Shelvey (Newcastle United) right footed shot from outside the box is high and wide to the right. Assisted by Mohamed Diamé.
Goal!  Hull City 1, Newcastle United 1. Robert Snodgrass (Hull City) left footed shot from the centre of the box to the centre of the goal.


Six Preston North End footballers were among seven players arrested in connection with a spot-fixing investigation, the BBC understands.

The club's captain John Welsh and players Keith Keane, Bailey Wright, David Buchanan, Ben Davies and Graham Cummins were arrested on Thursday.
All six have expressed their innocence to the club and have been bailed.
Barnsley midfielder Stephen Dawson was also arrested and bailed. He has been unavailable for comment.
The investigation concerns matches this season and last season.
A Preston North End spokesman said: "We are disappointed that individual player names are in the public domain given that none of these individuals have been charged with any offence.
"Having had time to meet with all the individuals concerned we reiterate our position that all players will remain available for selection by the manager and that until or unless the current situation changes it will be business as usual."
In a statement, Barnsley Football Club said it was "aware of reports in media in connection with an investigation into individuals suspected of conspiracy to commit acts of bribery and money laundering relating to conduct during football matches".
The BBC understands three of the Preston players are expected to play on Saturday.
Ben Davies and Graham Cummins are on loan at League Two sides York City and Rochdale respectively.
On Thursday, the National Crime Agency said six other men arrested in December on suspicion of involvement in spot-fixing and later bailed, had been re-arrested.
Those arrested in December - including former Premier League player DJ Campbell - had been bailed to return on 8 April.
Spot-fixing is where a player corruptly influences a specific element of a match, for example by intentionally getting a yellow card or conceding a corner, without trying to fix the final score.


As EU migrants face a backlash in Cambridgeshire in the wake of the referendum result, the entrepreneur behind a small chain of Polish delis fears for her future.

MAP HERE (MAKE SURE MAP LIVE): 36696356
Elena Hrabovenska goes to the staff area to retrieve the letter from her handbag. From the way she has spoken about it, I'm expecting a long, heartfelt message. But it's a simple note scrawled on scrap paper:
"My wife told me that hate mail and phone calls have been made to the Polish shops in Huntingdon. The people who do this are a minority. The Poles add to Britain: they have always been welcome."
Days after the historic referendum to leave the EU, cards with the words "No more Polish Vermin" were left outside schools and homes in Huntingdon, where Elena runs a Polish deli.
"On that day five British people came into the shop and they said they are really sorry. They are ashamed of that person who's done it."
Elena's main concern, she says, is that words will escalate to physical violence.
After struggling to find the right words, she says: "Around the world you will always find someone who has the stone instead of the heart."
Elena owns three Polish delis, one in Huntingdon and two nearby in Peterborough.
She came to England in 2003 from Ukraine, aged 19. She arrived alone on a working visa, with Â£100 in her pocket. She knew nobody.
At the time there was only one shop selling Central and Eastern European food in Peterborough, she recalls.
Despite having a good grasp of English, she struggled to find the ingredients she needed to make the traditional soups she missed. This gave her the idea to open a deli with food imported from Central and Eastern Europe, with staff that can speak Polish and Russian.
A few years after arriving in the country, her first deli was born.
To stock that first shop, her husband would continually make the 36-hour round trip to Poland by van.
There was a clear business opportunity as more and more Poles arrived in the UK, after they were given the right to work here in 2004.
Elena's business grew and a decade later, she employs 20 people and has two refrigerated trucks making the journey to Poland and back.
There is an obvious irony, of course, that she was a Ukrainian building a Polish deli empire. But in fact many of the Polish delis that have emerged in the UK are owned by non-Poles. Many are run by Turkish businessmen and women. It is a similar phenomenon to Bangladeshis owning Indian restaurants.
When asked how she feels about the referendum result, her first thought is for her business.
"We put against this business basically everything, the time we could spend as a family... to achieve this place we would work 48 hours without a wink [of sleep]."
Her fear is that her delis will be hit by a weaker pound and ultimately, if the UK leaves the single market, import tariffs on Polish food.
"I feel responsible for my staff. I don't want to face that time when I have to announce, 'I'm sorry girls I have to close, I have to cut staff or hours.' They have families as well, they have children.
"All of them were asking what is going to happen and I didn't want to answer.
"[But] I know we live in the 21st Century, someone is not going to knock on our doors and throw us away."
Peterborough voted by 60.9% in favour of leaving the European Union.
Customers have not talked about it, "like they are in shock", says Elena.
But the result did not surprise her. She has noticed ill-will towards migrants in the city.
Peterborough is often cited as a place strongly affected by EU internal migration.
The last census revealed that its population rose by almost 18% between 2001 and 2011, reaching 183,631. People from Central or Eastern Europe made up 7.7% of the city's population by 2011. Many are drawn by the seasonal farm work available nearby.
"Some immigrants are not perfect and put a black mark on the immigrant's name," says Elena.
However, she says she wants people to remember that "a lot of families are coming here to seek a better life and work hard".
Her latest, newly-opened shop is a bright mini-supermarket, neatly tucked behind a Tesco, nestled next to a Chinese takeaway.
She reckons 25% of her customers here are English.
With so many rival Polish delis, she explains, she has had to open this larger shop to compete on choice.
Despite successful expansion, migration of another kind has posed the biggest threat to her business, she explains.
Gridlock at Calais caused by illegal migrants has disrupted her fragile supply chain. She has had to unload trucks through the night to make up for lost transit time.
On one of the walls in Elena's shop you will see Polish football scarves, magazines, adverts and books that are all in Polish.
"When customers come into the shop they think they are back in Poland," remarks Elena.
So does she think shops like hers represent a failure to integrate with the local community?
This kind of shop "will vanish", she predicts, after a pause, by way of answer.
"There is a new generation coming. Obviously they will still have in their hearts that their parents were Polish, but they will integrate into the English community as happened with other nationalities.
"There will be mixed families, with Polish mums and English dads, for example, two cultures mixed together.
"It's going to soften."
Follow business reporter Dougal Shaw on Twitter.
This feature is a part of a new series from the BBC Business Unit called My Shop. To suggest a shop email us.


West Brom's £12m summer signing Jay Rodriguez scored his first goal for the club as the Premier League side saw off League Two Accrington in the EFL Cup.

Tony Pulis made just four changes, with Salomon Rondon heading home the opener from Rodriguez's whipped cross.
The Baggies doubled their lead before the break when Matt Phillips took down a ball over the top and rifled in.
Rodriguez cut inside to drill a third into the bottom corner, while Tom Dallison slotted in a late consolation.
Kayden Jackson had a penalty appeal turned down for the hosts immediately before Rodriguez's strike, while substitute Mekhi McLeod twice went close for Stanley, forcing Boaz Myhill to tip wide of the post.
Rondon and Rodriguez, who signed from Southampton last month, were wasteful in front of goal as the Baggies could have won by a wider margin.
West Brom, captained by recent signing Gareth Barry, have won all three of their games this season, while defeat for John Coleman's side ended their perfect home record this term.
Match ends, Accrington Stanley 1, West Bromwich Albion 3.
Second Half ends, Accrington Stanley 1, West Bromwich Albion 3.
Seamus Conneely (Accrington Stanley) wins a free kick in the attacking half.
Foul by Nacer Chadli (West Bromwich Albion).
Goal!  Accrington Stanley 1, West Bromwich Albion 3. Tom Dallison (Accrington Stanley) right footed shot from the centre of the box to the bottom left corner. Assisted by Billy Kee.
Attempt blocked. Billy Kee (Accrington Stanley) right footed shot from outside the box is blocked.
Liam Nolan (Accrington Stanley) wins a free kick in the attacking half.
Foul by Matt Phillips (West Bromwich Albion).
Corner,  Accrington Stanley. Conceded by Nacer Chadli.
Attempt blocked. Sean McConville (Accrington Stanley) right footed shot from outside the box is blocked.
Sean McConville (Accrington Stanley) wins a free kick in the defensive half.
Foul by Jonathan Leko (West Bromwich Albion).
Corner,  Accrington Stanley. Conceded by Craig Dawson.
Attempt blocked. James McClean (West Bromwich Albion) right footed shot from the centre of the box is blocked.
Corner,  Accrington Stanley. Conceded by Nyom.
Substitution, West Bromwich Albion. Rekeem Harper replaces James Morrison.
Attempt missed. Mekhi Leacock-McLeod (Accrington Stanley) right footed shot from the left side of the box is close, but misses the top left corner.
Foul by Jake Livermore (West Bromwich Albion).
Billy Kee (Accrington Stanley) wins a free kick in the attacking half.
Corner,  West Bromwich Albion. Conceded by Janoi Donacien.
Attempt blocked. Mekhi Leacock-McLeod (Accrington Stanley) right footed shot from the centre of the box is blocked.
Foul by Craig Dawson (West Bromwich Albion).
Mekhi Leacock-McLeod (Accrington Stanley) wins a free kick in the defensive half.
Corner,  Accrington Stanley. Conceded by Boaz Myhill.
Attempt saved. Mekhi Leacock-McLeod (Accrington Stanley) right footed shot from outside the box is saved in the bottom left corner.
Attempt blocked. Jonathan Leko (West Bromwich Albion) right footed shot from the centre of the box is blocked.
Attempt missed. Mekhi Leacock-McLeod (Accrington Stanley) right footed shot from outside the box is close, but misses to the right.
Substitution, Accrington Stanley. Mekhi Leacock-McLeod replaces Kayden Jackson.
Substitution, Accrington Stanley. Seamus Conneely replaces Scott Brown.
Substitution, West Bromwich Albion. Jonathan Leko replaces Jay Rodriguez.
Substitution, West Bromwich Albion. Jake Livermore replaces Gareth Barry.
Attempt missed. James Morrison (West Bromwich Albion) right footed shot from outside the box is close, but misses to the right.
Goal!  Accrington Stanley 0, West Bromwich Albion 3. Jay Rodriguez (West Bromwich Albion) right footed shot from the centre of the box to the bottom left corner. Assisted by Matt Phillips.
Attempt missed. Kayden Jackson (Accrington Stanley) right footed shot from the centre of the box is close, but misses to the left.
Attempt saved. Salomón Rondón (West Bromwich Albion) right footed shot from the centre of the box is saved in the centre of the goal.
Foul by Craig Dawson (West Bromwich Albion).
Jordan Clark (Accrington Stanley) wins a free kick in the defensive half.
Corner,  West Bromwich Albion. Conceded by Ben Richards-Everton.
Attempt missed. Salomón Rondón (West Bromwich Albion) left footed shot from the centre of the box is just a bit too high.
Attempt saved. Sean McConville (Accrington Stanley) right footed shot from outside the box is saved in the centre of the goal.


Police searching a river for the parents of a 13-year-old girl found alone on a hired boat in the Norfolk Broads have recovered two bodies.

The bodies of a man and a woman were found between Salhouse Broad and Wroxham Broad after a search by divers.
The boat was found on Saturday tied to a tree, close to Salhouse Little Broad, after police were called because it had not been returned as arranged.
Police are not looking for anyone else in connection with the deaths.
The woman's body was found just after 14:00 BST on Sunday while the man's body was found after 16:35 BST.
Police said the girl - who was found on the boat unharmed - had been told about the deaths and was being comforted by relatives.
Post-mortem examinations are due to be carried out on Monday while formal identification of the bodies has yet to be carried out, police said.
Head of the investigation, Det Supt Pete Hornby, said officers were in the early stages of their inquiries "working to establish the sequence of events which led to this evening's tragic outcome".
"The motives surrounding the incident remain unclear but at this time we are not looking for anyone else in connection with the deaths," he added.
Police said they were called at 17:00 BST on Saturday by a member of the public concerned about the whereabouts of the boat and that it was found shortly afterwards.
The girl, who was found on board alone but unharmed, spent Saturday night in protective custody.
The craft was taken to Le Boat boatyard in Horning where it continues to be examined by police.
A mile-long section of the River Bure between Salhouse and Wroxham broads - closed while police searched the area - has reopened to boating traffic.


Wales wing George North says it will be hard to match the southern hemisphere style of play when they face New Zealand in the first Test on Saturday.

Warren Gatland's side will take on the All Blacks in a three-game Test series, as well facing Chiefs on 14 June.
"The way they play, the speed of the ball, numbers in contact, it's a completely different game," North said.
"Which is why it is such a hard task to try and match that with what we play up in the northern hemisphere."
North says it has been beneficial for Wales to arrive in New Zealand ten days ahead of the first Test against the three-time world champions, following a long season which included a World Cup campaign last autumn.
"It's a huge task for us. We know that especially after a long season as well, but to come and play the world champions at home was always going to a massive task," North told BBC Wales Sport.
"We needed some time to get over the jet-lag, which is a nightmare, recharge and then turn our minds to the first test on Saturday. It's been good for us and good for the boys to have this time here.
"A three test series in such a short period is going to be tough but we're all ready for it."
Armed with the task of beating the All Blacks after 26 unsuccessful attempts, it will prove a formidable task for North his teammates, but he is looking forward to the challenge.
"We've got to try and contain and defend really. It'll be good so see where we are at the end of it," North added.
"The team have been working hard now for more than a year what with the World Cup and now we've come here.
"It's a huge challenge and to win here would be a huge achievement for the team."


Sinn FÃ©in's Martin McGuinness has said it was "absolutely appalling" to hear Gregory Campbell's remarks about the Irish language at the DUP conference.

Gregory Campbell  told DUP members at the weekend the party  would treat Sinn FÃ©in's "entire wish list" as no more than toilet paper.
He also made reference to the 'curry my yoghurt' row from earlier this month.
Mr McGuinness said he was "very disappointed" that Mr Campbell had not been reprimanded by the DUP leadership.
"Under no circumstances can this be passed over as comedy. It was absolutely appalling and there was nothing funny about it," he said.
"It's time to grow up, time to show some maturity, time to stop playing to the lowest common denominator, time to show some leadership."
He said the only thing people would remember about the DUP conference was Mr Campbell's remarks.
"If the DUP don't see how damaging that is for them as a political party then I think that sends out a very negative message."
Earlier in the assembly, DUP leader Peter Robinson said Mr Campbell had a dry sense of humour and claimed some people were playing politics with the Irish language.
"The language and culture surrounding it must be protected; when it starts to get drawn into the political realm we start to undermine and dilute the importance of the language," the first minister added.
Mr Robinson said there was a need to differentiate between "lampooning those who are involved in a political campaign related to the Irish language and those who genuinely speak the Irish language".
He said Mr Campbell's "finger was being pointed at those who politically abuse the Irish language".
Earlier this month, Mr Campbell began an address to the assembly with: "Curry my yoghurt can coca coalyer" in imitation of the Irish sentence "go raibh maith agat, Ceann Comhairle" which translates as "thank you, Speaker".
On Monday he said: Mr Campbell said: "Exposing those politicising the Irish language, as well as those making unrealistic political demands at the talks table is the right thing to do.
"How dare anyone try to suggest that it is something to be ashamed of?
"I will not be apologising for, or deviating from doing the right thing."


The value and volume of retail sales grew in Scotland last year but lagged behind Great Britain as a whole, according to new figures.

Sales volumes were up 3.1% in the fourth quarter of 2016 when compared with the same period the previous year.
The value of those sales, without adjusting for inflation, grew by 2.7% annually.
Equivalent growth in volume and value across Britain was 5.6% and 5.9% respectively.
The Retail Sales Index figures were compiled by Scotland's chief statistician.
They showed the volume of retail sales in Scotland fell by 0.5% - after seasonal adjustment - in the last three months of 2016, when set against the previous quarter.
This compared with growth of 1.2% in Britain as a whole.
The value of sales grew by 0.3% from the third quarter to the fourth, and by 1.9% in Britain.
Scottish Retail Consortium director David Lonsdale said: "These figures broadly mirror the findings of our own surveys which noted a more positive trading environment for Scottish retailers in the final quarter of last year.
"Shopkeepers witnessed a second successive quarter of growth in retail sales values in Scotland, albeit the pace eased compared to last autumn.
"These figures are welcome at a time when retailers are continuing to grapple with changing shopping habits and with predictions of choppier times ahead for consumer spending, with inflation set to pick up in earnest over this year and act as a drag on consumer spending."


Svetlana Kuznetsova hacked off part of her own hair at a changeover as she beat Agnieszka Radwanska 7-5 1-6 7-5 at the WTA Finals in Singapore.

The Russian, 31, who qualified for the event ahead of Britain's Johanna Konta, cut her thick plait in half with scissors at the start of the third set.
"It was bothering me a lot. When I was hitting the forehands I hit a good shot and it would hit my eye," she said.
"I thought, 'what's more important? My hair, which can grow, or the match?'"
Kuznetsova asked the umpire to supply her with a pair of scissors to carry out her impromptu haircut.
Defending champion Radwanska said she was unaware of the incident, but agreed with her opponent's priorities.
"I didn't even know that," said the Pole. "Good thing she didn't cut her anything else. I think hair is not very important."
It was just one dramatic moment in a three-hour match in which Kuznetsova recovered from 4-1 down to take the first set, saved a match point in the third and was tearful at a changeover before prevailing.
Kuznetsova endured a hectic build-up to the season finale, winning the Kremlin Cup in Moscow on Saturday to collect the ranking points she needed to edge out Konta in the race for the eighth and final qualifying spot before flying to Singapore.
It is not the first time a tennis player has taken action after being distracted by their own locks on court. Britain's Andy Murray snipped his fringe during his defeat by Rafael Nadal at last season's ATP Finals.
Find out how to get into tennis in our special guide.
In the White Group's other match in Singapore, Karolina Pliskova also saved a match point as she overcame French Open champion Garbine Muguruza 6-2 6-7 (4-7) 7-5.
World number one Angelique Kerber, who beat Dominika Cibulkova in her Red Group opener on Monday, takes on Simona Halep in the pick of Tuesday's matches, with Cibulkova playing Madison Keys in the other match.
Two players will progress from both the Red and White Groups to contest the semi-finals.


Aldershot's 11-match unbeaten run came to an end as Jordan Preston's solo effort secured victory for Guiseley.

Preston struck nine minutes into the second half to hand the Shots their first National league defeat since December 17.
Home goalkeeper Jonathan Maxted produced a fine save to tip Shamir Fenelon's close-range effort on to the crossbar as Aldershot had the better of a goalless first half.
But the hosts took the lead nine minutes into the second period when Preston's forceful run ended with him slotting past Jake Cole.
Cole produced a fine save to prevent Will Hatfield making it 2-0 soon after, while Aldershot were denied an 81st-minute equaliser when Jake Gallagher hit a post.
Match report supplied by the Press Association.
Match ends, Guiseley 1, Aldershot Town 0.
Second Half ends, Guiseley 1, Aldershot Town 0.
Substitution, Guiseley. Derek Asamoah replaces Jordan Preston.
Substitution, Guiseley. Adam Boyes replaces Jake Cassidy.
Substitution, Aldershot Town. Callum Buckley replaces Cheye Alexander.
Substitution, Aldershot Town. Jonny Giles replaces Idris Kanu.
Goal!  Guiseley 1, Aldershot Town 0. Jordan Preston (Guiseley).
Second Half begins Guiseley 0, Aldershot Town 0.
First Half ends, Guiseley 0, Aldershot Town 0.
First Half begins.
Lineups are announced and players are warming up.


Thousands of people have taken part in a half marathon dedicated to a runner who died after completing the race last year.

Nick Palmer, 37, collapsed at the finish line of the Southend half marathon in June 2014.
His son, George, seven, sounded the klaxon to set more than 2,000 runners on their way in Shoeburyness on Sunday.
Parents Alan and Linda Palmer said their son had a "passion for running" and the event was a "fitting tribute".
"This past year we have been overwhelmed with the kind messages of support from Nick's friends, family, running club colleagues and the local community - it has meant a great deal to us," they said.
Mr Palmer's family raised more than Â£10,000 in his memory, which was donated to Great Ormond Street Hospital, where George had received treatment.
Mr and Mrs Palmer said this year's event was "emotional for all those who knew and loved Nick", but added it had been "wonderful to see everyone coming together to remember him in this way."
Judy Grocott, Events Manager at Havens Hospices, said: "Following Nick's tragic death last year we wanted to remember him and honour his memory at this year's run."
The event, which marked the 20th anniversary of the coastal run, raised money for Fair Havens and Little Havens hospices.


Newport's half marathon course was 636 metres short of the required 13.1 miles, it has been confirmed.

Phil Cook, of the Association of UK Course Measurers, re-measured it after runners questioned the distance.
Mr Cook said he could not pinpoint a specific location where an error was made by organisers.
He said: "This obviously doesn't affect people who ran for charity. But if it was for an official time, unfortunately you haven't got it."
The event, held on Sunday 1 March, was criticised by some runners after they found their personal best times were faster than expected.
After concerns were raised, St David's Hospice, which organised the race, said it believed the distance was correct.
Chief executive Emma Saysell said: "As far as we're concerned the course was measured by an accredited professional.
"The course length was accurate based on what they told us."


The detail of a second email from a whistleblower to Arlene Foster warning her about abuse of a heating scheme has been revealed.

The whistleblower emailed Mrs Foster's DUP office account with concerns about the heating scheme.
The email warned the scheme was leading to misuse.
The DUP said the First Minister's office had no record of the email, but no reason to believe that it was not sent or received.
On 3 September 2013, a whistleblower wrote to Mrs Foster - who was then enterprise minister - outlining their concerns.
The existence of this email was reported by the Irish News last Thursday. This email has now been seen by the BBC's Nolan Show.
The email said: "Given the benefits of RHI we find that many of our potential customers are no longer worried about becoming more efficient.
"In fact it pays them to use as much as they can. The incentive to use more is leading to misuse in some cases.
"I firmly believe that energy efficiency and sustainability should go hand (in hand) and I'd really appreciate 20-30 minutes if your time to see what you think."
The DUP responded by saying: "As has been apparent over recent days there is clearly some confusion over the precise details in relation to the emails.
"The First Minister has no formal record of any emails from this period as her records do not go back this far.
"Before the email of the 26th August was published the person who had sent the email was contacted by an official in the Department of the Economy who confirmed that the 26th August email had been the only direct contact with Arlene Foster, and the official's understanding was that she was content to release that email subject to redactions.
"We apologise if there was any misunderstanding, as we certainly would not have released the email had we thought that would be against her wishes.
"However, we understand that another email has come to light dated September 3  which makes a reference to concerns about the RHI.
"The First Minister's office has no record of this email, but equally no reason to believe that it was not sent or received.
"In any event the person in question contacted officials two days later on 5 September 2013 (in immediate response to the letter from the Minister) in order to set up a meeting at which her plans and concerns were discussed.
"We understand that at this meeting she also raised concerns about the RHI but, very unfortunately, these concerns were not taken sufficiently seriously.  At all times Mrs Foster sought to follow the appropriate processes in relation to this issue."
First Minister Arlene Foster faces a vote of no confidence at the Assembly later over her involvement in the botched heating scheme.


UK businesses face several years of uncertainty and upheaval due to Brexit, the Duke of York has told the BBC.

However, businesses should make the most of new international opportunities, Prince Andrew said.
He added that he is "as much in the dark as anyone else" about Brexit.
It's highly unusual for members of the Royal Family to comment publicly on contentious political issues and Prince Andrew is the first senior member of his family to address Brexit.
He told the BBC's Sharanjit Leyl that firms were cautious about Brexit, but that the UK "should be engaging with as many different markets as we possibly can and looking at the best of things rather than necessarily the worst of things".
The prince added: "You can either look at it as a glass half-empty - which is: 'Oh my God, why have we done this?'
"Or you could look at it as a glass half-full, which is: 'Ok, that's where we are. There are opportunities that we've got to make.'
"So... you may lose one thing but you may gain something else.
"The world is your oyster."
There are business opportunities in the 52 Commonwealth nations, as well as China and the US, the duke said.
"We've been concentrating on 27 countries, if you take that as an internal market.
"There's an external market that's a lot bigger, and many businesses hadn't looked over that garden fence to some extent.
"And in my experience recently, businesses that look over the garden fence have gone: "Hmm, [the] grass is not quite as dark and unforgiving as you might expect.
"And actually, getting over the fence, there might be some fresh grass out there."
The Queen's son was in Singapore to attend a Commonwealth science conference.
He was also hosting Pitch@Palace, a programme he started to support entrepreneurs from the UK and around the world.
Prince Andrew was a trade envoy for the UK from 2001 until mid-2011, when he stepped down.
His remit was to promote UK business interests abroad.
Following the general election last week, business leaders said they wanted a new direction for Brexit negotiations, with a renewed focus, and more specifics.
Manufacturers called on the UK government to adopt a more pro-business stance, or face political instability that may force more firms to alter their plans "away from the UK".
In his Mansion House speech on Thursday, which was cancelled following the Grenfell Tower tragedy, Chancellor Philip Hammond had been expected to reassure businesses that the government was ready to step in with extra financial support, as the Brexit deal is negotiated, if needed.
And at a joint news conference this week, French President Emmanuel Macron said the possibility of the UK remaining in the European Union is an option until Brexit negotiations have concluded.


Never before seen photographs have been released showing life in Jersey's prisoner of war camp.

Images include prisoners taking part in a snowball fight during World War One and a tunnel which may have been dug as part of an escape attempt.
The pictures have been shared by the great nephew of Captain Eli Bowers, who was among the camp's guards.
They "add to our understanding of the history of the camp", said island historian Ian Ronayne.
The site at Les Blanches Banques housed nearly 2,000 men from the German armed forces from 1915-1917.
Dr Brian K Feltman, from Georgia Southern University in the United States, said the snowball fight showed prisoners "breaking the monotony of camp life".
He said it could be an example of prisoners staving off "barbed wire disease", a form of depression associated with "the boredom and regulations" imposed on prisoners of war.
Mr Ronayne, a WW1 blogger for Jersey Heritage, said some of the images showed tunnels which may have been used during one of the attempts to escape the camp.
He said if the images related to one of these incidents it would be a "fantastic find".
Another showed two sets of fencing at the camp - "barbed wire on the inside... and then an electrified fence" -  which was rare, according to Dr Heather Jones from the International History at the London School of Economics.
"I have not come across an electric fence being used for a UK home front prisoner of war camp before," she added.
Capt Bowers served in the Royal Jersey Militia and took the six photos from late 1916 to early 1917.
Helier Falle found the pictures in his mother's house.
"Rather than leave them sitting in a drawer for nobody to see, I thought they should be shared," he said.
Though he had seen similar photos auctioned, he added "it wouldn't feel right to profit from them".


The Radisson hotel chain says it is suspending its sponsorship of Minnesota Vikings, an American football team.

It comes after one of the team's players, Adrian Peterson, was charged with child abuse in Texas after hitting his son with part of a branch.
The Minneapolis team have reinstated the player after dropping him.
Meanwhile sponsors of the NFL as a whole have raised concerns about incidents of violence in the sport.
McDonald's, Visa, Anheuser-Busch and Campbell Soup Company have all issued statements urging the NFL to take "appropriate" action to deal with the incidents.
"We understand. We are taking action and there will be much more to come,'" the NFL said on Tuesday in response.
But Radisson is the first sponsor to pull their support from a team.
"Radisson is suspending its limited sponsorship of the Minnesota Vikings while we evaluate the facts and circumstances," the company said.
It added it "takes this matter very seriously, particularly in light of our long-standing commitment to the protection of children".
Radisson's sponsorship includes a banner visible to viewers watching Vikings' news conferences.
The Minnesota Vikings said it had "respectfully honoured Radisson's request", a team spokesman said.
Mr Peterson stands accused of using part of a tree branch to spank his four-year-old son. The player says he was using a form of discipline his father used on him as a boy.
"I am not a perfect son. I am not a perfect husband. I am not a perfect parent, but I am, without a doubt, not a child abuser," Mr Peterson said in a statement.
"I am someone that disciplined his child and did not intend to cause him any injury."
The Vikings dropped the player for Sunday's game but then reinstated him on Monday.
The team's general manager, Rick Spielman, said: "I understand that this is a very difficult thing to handle. But we also feel strongly as an organisation that this is disciplining a child.
"Whether it's an abusive situation or not, or whether he went too far disciplining, we feel very strongly that that is the court's decision to make, but we also understand the seriousness of abusing children as well.''
The charges against Mr Peterson come just days after another NFL star, Ray Rice, had his contract terminated after a video emerged in which he appeared to punch his wife.


Crowds throwing bottles, chairs and a suspected petrol bomb clashed with riot police at an illegal rave in south London.

The Met Police said officers were attacked when they arrived to close the event, in a disused building in Lambeth, late on Saturday.
Fourteen officers were injured and eight people arrested, the force said.
In a social media message, organisers of the event accused police of "bashing people senseless".
Police said the unlicensed music event was shut down shortly before 07:00 GMT.
They described being attacked with missiles by the group and said criminal damage was caused to cars and private property.
They said a member of the public, a man, was also treated by London Ambulance Service.
Commander Mak Chishty said: "Last night police faced hostility and attack; this is completely unacceptable. "
Southwark Police tweeted a picture of broken chairs and other debris writing: "Tired and bruised having had all of this, and more, thrown at us. Yes, that includes the propane tanks."
The injuries sustained by police were described as "minor" and they were treated at the scene.
BBC reporter John Sweeney was woken in the early hours of the morning by the sound of the crowds outside his north Lambeth home. The footage above was filmed from his window.
"It was like a dark ballet, choreographed by Edvard Munch - many of the people were wearing Halloween and Day of the Dead costumes," he said.
"It was mad - and it was maddening. I've just been going around with Syrian refugees to find a little boy and I never felt under threat. But here I was in my own house, scared because outside someone was sat on the roof of my car."
He said most of those involved appeared to be in their late teens or early 20s and did not seem to be local.
"It was about 3am and the police were outnumbered. There was a kind of rain of bricks, poles and spiky bits of wood being thrown at them. The police were going forward, and being beaten back.
"There was a fire in the street, being fuelled by wood from our neighbour's fence.
"These people, for no reason, were deliberately seeking to hurt people who happened to be wearing a uniform, defending other people's property. This was collective madness and collective badness."
He said he had another reason to be concerned about his car - the ashes of his father were in the boot.
"If it had been on fire, I wouldn't have minded losing the car - but I didn't want my dad's ashes being disrespected."
Crowds first gathered on Black Prince Road at Albert Embankment, across the river from Westminster, before dispersing down Lambeth Road on to Lambeth High Street and nearby Whitgift Street.
They reportedly charged at police, set fire to bins and chanted "scum" and "pigs".
One witness described the scene as "mayhem".
A resident told BBC Radio London: "There was a lot of smashing going on, a lot of banging. It was difficult getting home."
Others took to social media to vent their frustration at the disturbance.
Rhodri tweeted: "They're now gathering on my street. There are families here with young kids that don't deserve this disruption. #Lambeth."
The event - called Scumoween: A Nightmare On Scum Street - had been advertised on Facebook to take place in Whitgift Street, starting at 20:00 on Saturday and lasting until 06:00 on Monday.
Of 13,000 invited guests on the social networking site, about 4,000 said they planned to attend.
On Wednesday, organisers had advised: "Stay peaceful, stay calm. Patience and numbers is in our favour. Do not antagonise the police. We don't need to.
"At the end of the day we want to leave them remembering our good attitudes, we just came to dance, we are not their enemy."
However an updated message on the event's Facebook page, posted after the disturbance, accused police of "bashing people senseless" and "letting their dogs go at people almost unrestrained".
"The police were not interested to talk through peaceful resolutions," the message added.
Anyone with any information about the disorder is urged to contact police by calling 101 or Crimestoppers anonymously on 0800 555 111.


The problem with being in the tech business is that it's easy to get left behind.

The rise of smartphones, then tablets and Google's Chromebooks and now the first wearable tech, have threatened to send shipments of Windows laptops and desktops adrift.
PC shipments slumped by about 10% between 2012 and 2013, according to research firm Gartner.
But recent data from the firm suggests the beginnings of a turnaround with many of the major manufacturers reporting rising demand for their Windows PCs, even if sales remain substantially below where they were two years ago.
Microsoft's phasing out of Windows XP has helped, but innovations including detachable keyboards, longer battery life and touchscreens have also played a role.
Taiwan's Computex - which has just got under way - has long been a good place to get a first peek at PC-makers' latest hardware.
The tech trade show - Asia's biggest - provides an opportunity for manufacturers to gauge reactions to what are sometimes "out there" designs before deciding which devices to throw production and marketing budgets behind.
Perhaps the oddest machine at this year's show is one by Asus.
The Transformer Book V laptop-tablet hybrid features a dock on the back of its screen into which a smartphone can be plugged.
The design allows the device to either run off its own processor or the handset's chip, in a bid to give its owner the best of every possible world.
"The tablet can be used independently and when combined with a keyboard dock turns into an Android laptop, and with the switch of a key will turn into a powerful Windows laptop for ultimate productivity," explains Jonney Shih, chief executive and president at Asus.
Not everyone is convinced it's ready to go mass market.
"It's very much a niche product," says Chris Green, a tech analyst at the Davies Murphy Group consultancy.
"It's not entirely clear what gap Asus is trying to fill, but if the firm is not looking for it to sell in high volumes, then it may well work in a limited space."
Acer's Aspire Switch 10 - which is also on show - might not be quite as radical a design but its introduction of magnetic "snap hinges" - that connect the tablet-laptop hybrid's keyboard to its screen - impress by allowing the display to be flipped to face whichever way the user prefers.
The firm has sold 160,000 units of the machine since it launched last month, reveals business manager Richmond Cheng, who adds that Acer plans to launch a "cost-down" version by August.
One of the other technologies being promoted at the show are Windows computers that feature higher-than-normal-definition screens.
Gigabyte is showing off a Windows laptop with a "3K" display - representing a 3,200 x 1,800-pixel resolution - that promises sharper, more detailed graphics, albeit at a cost to battery life.
Asus and Toshiba have gone one better with 4K (3,840 x 2,160-pixel) displays on their Zenbook NX500 and Toshiba Satellite P50t laptops - four times the resolution of a standard 1080p "full HD" screen.
For now the high cost of the machines mean they are being marketed at gamers and other early adopters. But when prices fall, expect such technology to be targeted at photographers, video-makers and those wanting to fit as much legible content as possible on their screen.
Consumers willing to go for a less portable solution are being promised that 4K desktops could soon tumble in price.
Samsung - a leading monitor panel maker - and Intel have announced they are collaborating on a way to cut costs, a move they suggest could soon lower the price of all-in-one 4K desktop PCs by more than half to as low as $999 (Â£597).
But while there is lots of new Windows-related kit at Computex, many of the announcements have focused on Google's mobile OS.
Taiwan's Acer is promoting its new Android tablet, the 8in Iconia Tab 8, as well as five new Android smartphones.
Asus unveiled new Fonepad handsets, including its first to boast a 64-bit processor - a feature the device uses special software to take advantage of, since Android itself is still built with 32-bit code.
And HP confirmed the existence of a new Android laptop.
The 14in wasp-coloured Slatebook cannot be detached from its keyboard, unlike the firm's last Android product that went by the same brand name.
The $399 price may attract some - but it's a real question why shoppers wouldn't opt for a tablet and keyboard or Chromebook instead.
Even so, Mr Green suggests it will be innovations around Android and not Windows that will take the upper hand at Computex and other computer trade shows in the years to come.
"Windows still has a place right now because of the size of the installed user-base, but there is nothing to suggest at the moment that it will continue to retain as dominant a place in the medium to long-term," he says.
"The so-called recovery in Windows device sales is a blip, an attempt almost to jump-start interest.
"But with the increases in performance and power efficiency that we're seeing from Android devices, they will pose an increasing threat to the conventional computing platforms."


US cyber-spies have collected millions of photos of people's faces from the net for use in facial-recognition programmes, according to reports.

The New York Times says leaked National Security Agency documents show in 2011 it intercepted about 55,000 "facial-recognition-quality images" every day.
The leaks suggested the photos had been harvested from emails, text messages, social media and video chats, it says.
The NYT added the images were then cross-referenced with other databases.
These are said to include photographs of airline passengers, and pictures taken from other countries' national identity-card schemes.
The NSA has said that it does not have access to photos taken for US passports or US driving licences, but declined to comment about photos submitted by foreigners applying for visas to the country.
"We would not be doing our job if we didn't seek ways to continuously improve the precision of signals intelligence activities - aiming to counteract the efforts of valid foreign intelligence targets to disguise themselves or conceal plans to harm the United States and its allies," Vanee Vines, an NSA spokeswoman said.
The allegations are the latest to result from documents released by Edward Snowden, who gathered the material while working at the NSA's regional centre in Hawaii.
The papers themselves highlight the limitations of relying on face-matching technology.
The NYT reported that Tundra Freeze - the codename for the NSA's main in-house facial-recognition effort - had returned several obvious mismatches when it had tried to identify a photo of a young bearded man with dark hair, according to a report dated 2011.
The paper said the software had also returned inaccurate results when agents had queried it about a photograph of Osama Bin Laden.
However, the NYT added that a leaked Powerpoint presentation had also provided an example where the software had successfully matched a photo of a bald man taken at a water park with another picture of the same person taken when he had hair, was wearing different clothes, and was at a different location.
Campaign group Privacy International said it was concerned about the security agencies' use of such facial-recognition tech.
"Though it's perceived as a sophisticated technique, even the NSA admits in its own presentation how prone to error it is," spokesman Mike Rispoli told the BBC.
"Not only is our most personal of information being collected, stored, and analysed, it's being done through faulty systems where there are no legal frameworks or safeguards.
"This latest revelation shows that intelligence agencies want to see everything and identify everyone.
"Their attacks on identity databases around the world shows just how right the UK was right to abandon the national ID [card]. Any national database is now a treasure trove for  intelligence agencies, both domestic and foreign."
This is not the first of Edward Snowden's leaks to involve facial images.
In February, the Guardian reported British spy agency GCHQ had intercepted webcam images from millions of Yahoo users around the world.


The Welsh Liberal Democrats have called for public services to be improved for gay, lesbian and transgender people.

Improved teaching of issues around sexuality and gender can ensure young people leave school more tolerant of others, the party says.
The Lib Dems also called for housing policies and health services to be tailored for the LGBT community.
Spokesman Peter Black said: "There's a lot of things we can do better but we are moving in the right direction."
He added: "I think the cost of delivering these services is actually quite small.
"But what we need to do is make sure the policies are right, and that people are trained to deliver these services in health, education and housing right across Wales."
A Welsh Labour spokesman said the party was "committed to ensuring equal treatment and equal rights for lesbian, gay, bisexual and transgender people right across Wales".
"When accessing education, healthcare, jobs or local services nobody should be treated any differently because of their gender or sexual orientation.
"Welsh Labour has acted - at both an Assembly and a UK level - to ensure equal treatment for lesbian, gay, bisexual and transgender people in Wales."
Plaid Cymru candidate Glyn Wise said his party had a "strong history" of standing up for LGBT rights.
Policy offerings include developing a gender identity clinic, and for men and boys to be offered the HPV vaccine for a cancer common in gay men.
The Welsh Conservatives promised a zero tolerance approach to hate crime, and more LGBT representation on the boards of public services.
UKIP spokesman Mark Reckless said: "UKIP supports equal treatment for all, welcomes progress which had been made on LGBT rights, and will work in the fifth assembly for a Wales which is fairer to all."


Plans for an EU-wide financial markets watchdog have been put forward by the European Commission.

The proposed "European Security Markets Authority" would initially regulate credit rating agencies, but could be given broader powers at a later date.
The agencies gave their highest "AAA" rating to billions of dollars of debts that went bad in the financial crisis.
Michel Barnier, the commissioner behind the proposal, has also advocated a single European banking regulator.
The internal market commissioner wants national regulators to transfer all their supervision powers over the rating agencies to the new authority.
"In contrast to banks and insurance companies, rating services are not linked to particular territories," the Commission said in a press release.
US inquiry grills ratings agency
"The changes to rules on credit rating agencies will mean better supervision and increased transparency in this crucial sector," said Mr Barnier.
"But they are only a first step," he added. "We are looking at this market in more detail."
The rating agencies have been accused on both sides of the Atlantic of being a major culprit in the financial crisis.
In the US, a Congressional inquiry committee was due on Wednesday to question senior managers at rating agency Moody's, as well as billionaire investor Warren Buffett, about the agencies' role in the crisis.
In Europe, Mr Barnier criticised the rating agencies in May for their rapid downgrade of Greece's debts to "junk" status.
"I think we need to go further to look at the impact of the ratings on the financial system or economic system as a whole," he said at the time.
"The power of these agencies is quite considerable not only for companies but also for states."
The rating agencies stand accused of a conflict of interests, as their fees were paid for by the banks whose deals they were rating.
Under Mr Barnier's proposal, banks would be forced to disclose full details on their financial transactions to all the rating agencies.
The Commission hopes that this will encourage other rating agencies to provide unsolicited - and more impartial - ratings for these deals.
However, it is unclear what financial incentive there would be for them to provide these competing ratings.
Separately, the Commission has also published a proposal paper on changing the way in which financial institutions such as banks are governed.
Directors and major shareholders in banks have been criticised for allowing the banks' management to take on too much risk prior to the financial crisis.
The proposals include:
The corporate governance "green paper" is only intended to stimulate discussion, and the Commission does not expect to propose any specific new legislation on until 2011.


A charity football match has raised more than £35,000 for families affected by the Bosley mill explosion.

Four workers were killed in the blast when a huge explosion reduced Wood Treatment Ltd to rubble in July.
Former professional footballers, including ex-England winger Trevor Sinclair, took part in the game at Macclesfield Town.
Organiser Keith Innes said: "The last few weeks have been tough, the heart of the community has been ripped out."
He added: "The community has always been together - anybody will give anything for each other - but this has really cemented exactly what it is like to be from Bosley."
Will Barks, Derek Moore and Dorothy Bailey were identified as victims, but Jason Shingler, 38, remains missing.
The inquest into Mr Moore's death was opened and adjourned last month.
Fifty workers at the mill have been made redundant.
More than £100,000 has been raised so far by The Bosley Disaster Appeal Fund.
Sinclair, who scored a goal, was joined by ex-Man City players Paul Dickov, Shaun Goater and brothers Ian and David Brightwell, along with ex-Coronation Street actor Scott Wright and several Macclesfield Town players.


Amazon has seen a 50% fall in the amount of UK corporation tax it paid last year, while recording a 54% increase in turnover for the same period.

This snippet of news raised eyebrows this morning when it was revealed. So what's going on?
The answer is simple on the face of it.
Taxes are paid on profit not turnover. It paid lower taxes because it made lower profits. Last year it made £48m in profit - this year it made only £24m so it paid £7m tax compared to £15m.
What is more interesting is WHY its profits were lower.
Part of the reason is the way it pays its staff.
Amazon UK Services is the division which runs the fulfilment centres which process, package and post deliveries to UK customers. It employs about 16,000 of the 24,000 people Amazon have in the UK.
Each full-time employee gets given at least £1,000 worth of shares every year. They can't cash them in immediately - they have to hold them for a period of between one and three years.
If Amazon's share price goes up in that time, those shares are worth more. Amazon's share price has indeed gone up over the past couple of years - a lot. In fact, in the past two years the share price has nearly doubled, so £1,000 in shares granted in August 2015 are now worth nearly £2,000.
Staff compensation goes up, compensation is an expense, expenses can be deducted from revenue - so profits are lower and so are the taxes on those profits.
But surely this extra income for the staff is taxed? Probably not.
HMRC rules allow employees to receive £3,600 worth of shares from their employer tax free every year. Most of these awards are below that threshold.
The employee wins through a tax-free windfall, Amazon wins because it hasn't got to pay any cash out, which leaves HMRC as the big loser.
This is not just allowed by UK tax law - it is required by it.
So, weirdly, the more valuable Amazon becomes, the less tax this particular bit of its business pays.
There is heightened sensitivity around the tax affairs of technology giants such as Amazon, Google and Apple. The challenge of adapting a tax code written for a bygone era to work effectively on technology multinationals who have socked billions away in low tax jurisdictions remains.
But the practice of giving staff shares is widespread, generally seen as a good way to promote loyalty and engagement - and is 100% legal.


The former chairman of the Low Pay Commission has said that the minimum wage should be extended to gig economy workers.

Lord Adair Turner argued that the proliferation of "low-wage jobs" needed to be tackled and that some companies were categorising workers as "self-employed" to avoid low-pay protections.
The "gig economy" has become controversial after claims that food delivery companies and courier firms were exploiting employment law loopholes by saying that their workers were "self-employed".
Self-employed people do not receive the minimum wage.
"There is a subset of self-employed people - but not all self-employed - who are doing jobs that are pretty much employee-like," Lord Turner told me.
"And that category appears to have grown, at least in part, probably, because we have imposed a minimum wage on employees.
"It is a regulatory arbitrage, people are moving off to be self-employed or their employers, the people organising their work, are doing it."
Full employees have a legal right to receive at least the minimum wage - also called the National Living Wage - of £7.50 an hour.
Lord Turner, who was chairman of the Low Pay Commission between 2002 and 2006, said it was time to "essentially enforce" the minimum wage "on those categories of the self-employed who, when you really look at them, are essentially employed in the fundamental sense of how their work is organised".
Lord Turner was speaking after a report by the Resolution Foundation said that the minimum wage should be extended to gig economy workers.
The Resolution Foundation report estimated that there are about 1.1 million people now involved in work for firms such as Deliveroo and Uber - technology platforms which connect customers to individual delivery drivers.
"I think there are some bits of the gig economy which probably are only able to survive at the price they are provided to customers because they have essentially managed to find a way of turning what might have been an employee into self-employed," Lord Turner said.
"[That has] two benefits: one, it is not covered by the minimum wage and two, you don't have to play the employer's national insurance."
He argued that "paying a little more for food to be delivered" would be "perfectly reasonable".
Last autumn, the government launched an investigation into the new world of work which has seen self-employment and the gig economy grow.
The review by Matthew Taylor, head of the Royal Society of Arts, is expected to report shortly and will argue that although the UK economy has been good at creating jobs, the quality and pay of those jobs is questionable.
"The UK over the last 10 years has created a lot of jobs, but today, real wages are below where they were in 2007," Lord Turner said.
"That is not the capitalist system delivering its promise that over a decade or so it will raise all boats, and it is a very fundamental issue.
"It includes the gig economy, but it is wider than that. There is something about the economy which left to itself will proliferate very, very low-paid jobs."
Lord Turner said that tax inspectors from Revenue and Customs should be more aggressive investigating firms which were categorising workers as self-employed rather than employed.


Leicestershire have recruited batsman Cameron Delport for the T20 Blast.

Delport, who was born in South Africa but qualifies as a non-overseas player, has scored 2,045 T20 runs at an average of 25.56 with a strike rate of 135.70.
The 27-year-old left-hander played with elite performance director Andrew McDonald at Sydney Thunder in 2015.
McDonald said: "Cameron has experience in most of the world's top T20 competitions and his knowledge and skill will be valuable assets."
Delport shared the highest-ever one-day first-wicket stand with Morne van Wyk - an unbroken 367 set in a South African one-day game for Dolphins against Knights in Bloemfontein in October 2014.
Leicestershire's next match in the competition is against Lancashire at Old Trafford on Friday.


Colchester's search for their first League Two win of the season continues after they were soundly beaten by Luton Town.

Olly Lee scored on the stroke of half-time with James Collins and Dan Potts sealing the win for the Hatters in the second half.
Colchester went close early on, Doug Loft's long range effort testing goalkeeper Marek Stech, while Luton striker Danny Hylton's header was parried away by Sam Walker.
Town midfielder Lee was denied by an excellent save from Walker and Andrew Shinnie then shot straight at the keeper from Jack Stacey's cross.
Hatters were ahead on the stroke of half time, though, Lee firing home at the second attempt when a corner was not cleared.
After the break, Alan McCormack's fierce shot was superbly tipped over by Walker, although he could do nothing but watch as Collins curled into the top corner in the 52nd minute.
Hatters keeper Stech produced an incredible save to keep out Sammie Szmodics' close-range header, while Luton almost got a third, with Hylton heading against the bar.
Alan Sheehan saw his volley hit the woodwork too before Potts made it 3-0 with seven minutes remaining after touching home Sheehan's free-kick.
Match report supplied by the Press Association.
Match ends, Luton Town 3, Colchester United 0.
Second Half ends, Luton Town 3, Colchester United 0.
Corner,  Colchester United. Conceded by Dan Potts.
Attempt missed. Mikael Mandron (Colchester United) left footed shot from the right side of the box is close, but misses to the left.
Substitution, Luton Town. Elliot Lee replaces Danny Hylton.
Substitution, Luton Town. Jordan Cook replaces Andrew Shinnie.
Substitution, Luton Town. Harry Cornick replaces James Collins.
Attempt missed. Sean Murray (Colchester United) right footed shot from outside the box is just a bit too high.
Attempt missed. Tariq Issa (Colchester United) left footed shot from outside the box is just a bit too high.
Foul by Alan Sheehan (Luton Town).
Mikael Mandron (Colchester United) wins a free kick in the defensive half.
Goal!  Luton Town 3, Colchester United 0. Dan Potts (Luton Town) left footed shot from the left side of the six yard box to the bottom left corner. Assisted by Alan Sheehan with a cross following a set piece situation.
Jack Stacey (Luton Town) wins a free kick in the defensive half.
Foul by Tariq Issa (Colchester United).
James Collins (Luton Town) wins a free kick in the defensive half.
Foul by Lewis Kinsella (Colchester United).
Foul by Alan Sheehan (Luton Town).
Tom Eastman (Colchester United) wins a free kick in the attacking half.
Substitution, Colchester United. Tariq Issa replaces Drey Wright.
Attempt missed. Kane Vincent-Young (Colchester United) left footed shot from outside the box is close, but misses to the right.
Foul by Olly Lee (Luton Town).
Lewis Kinsella (Colchester United) wins a free kick in the defensive half.
Foul by Pelly-Ruddock Mpanzu (Luton Town).
Sean Murray (Colchester United) wins a free kick in the defensive half.
Corner,  Luton Town. Conceded by Kane Vincent-Young.
Attempt blocked. Alan Sheehan (Luton Town) left footed shot from outside the box is blocked.
Frankie Kent (Colchester United) is shown the yellow card for a bad foul.
Andrew Shinnie (Luton Town) wins a free kick in the defensive half.
Foul by Frankie Kent (Colchester United).
Corner,  Luton Town. Conceded by Sean Murray.
Danny Hylton (Luton Town) hits the bar with a header from the centre of the box.
Pelly-Ruddock Mpanzu (Luton Town) wins a free kick in the defensive half.
Foul by Kane Vincent-Young (Colchester United).
Hand ball by Denny Johnstone (Colchester United).
Substitution, Colchester United. Denny Johnstone replaces Cole Kpekawa.
Lewis Kinsella (Colchester United) is shown the yellow card for a bad foul.
Jack Stacey (Luton Town) wins a free kick in the defensive half.
Foul by Lewis Kinsella (Colchester United).
Corner,  Luton Town. Conceded by Tom Eastman.
Attempt blocked. Dan Potts (Luton Town) left footed shot from the centre of the box is blocked.


We were invited to Qatar by the prime minister's office to see new flagship accommodation for low-paid migrant workers in early May - but while gathering additional material for our report, we ended up being thrown into prison for doing our jobs.

Our arrest was dramatic.
We were on a quiet stretch of road in the capital, Doha, on our way to film a group of workers from Nepal.
The working and housing conditions of migrant workers constructing new buildings in Qatar ahead of the World Cup have been heavily criticised and we wanted to see them for ourselves.
Suddenly, eight white cars surrounded our vehicle and directed us on to a side road at speed.
A dozen security officers frisked us in the street, shouting at us when we tried to talk. They took away our equipment and hard drives and drove us to their headquarters.
Later, in the city's main police station, the cameraman, translator, driver and I were interrogated separately by intelligence officers. The questioning was hostile.
We were never accused of anything directly, instead they asked over and over what we had done and who we had met.
During a pause in proceedings, one officer whispered that I couldn't make a phone call to let people know where we were. He explained that our detention was being dealt with as a matter of national security.
An hour into my grilling, one of the interrogators brought out a paper folder of photographs which proved they had been trailing me in cars and on foot for two days since the moment I'd arrived.
I was shown pictures of myself and the team standing in the street, at a coffee shop, on board a bus and even lying next to a swimming pool with friends. It was a shock. I had never suspected I was being tailed.
At 01:00, we were taken to the local prison.
It was meant to be the first day of our PR tour but instead we were later handcuffed and taken to be questioned for a second time, at the department of public prosecutions.
Thirteen hours of waiting around and questioning later, one of the interrogators snapped. "This is not Disneyland," he barked. "You can't stick your camera anywhere."
It was as if he felt we were treating his country like something to be gawped at, suggesting we thought of trips to see controversial housing and working conditions as a form of entertainment.
"The Government Communications Office invited a dozen reporters to see - first-hand - some sub-standard labour accommodation as well as some of the newer labour villages. We gave the reporters free rein to interview whomever they chose and to roam unaccompanied in the labour villages.
"Perhaps anticipating that the government would not provide this sort of access, the BBC crew decided to do their own site visits and interviews in the days leading up to the planned tour. In doing so, they trespassed on private property, which is against the law in Qatar just as it is in most countries. Security forces were called and the BBC crew was detained."
"We are pleased that the BBC team has been released but we deplore the fact that they were detained in the first place. Their presence in Qatar was no secret and they were engaged in a perfectly proper piece of journalism.
"The Qatari authorities have made a series of conflicting allegations to justify the detention, all of which the team rejects. We are pressing the Qatari authorities for a full explanation and for the return of the confiscated equipment."
In perfect English and with more than a touch of malice, he threatened us with another four days in prison - to teach us a lesson.
I began my second night in prison on a disgusting soiled mattress. At least we did not go hungry, as we had the previous day. One of the guards took pity on us and sent out for roast chicken with rice.
In the early hours of the next morning, just as suddenly as we were arrested, we were released.
Bizarrely, we were allowed to join the organised press trip for which we had come.
It was as if nothing had happened, despite the fact that our kit was still impounded, and we were banned from leaving the country.
I can only report on what has happened now that our travel ban has been lifted.
No charges were brought, but our belongings have still not been returned.
So why does Qatar welcome members of the international media while at the same time imprisoning them?
Is it a case of the left arm not knowing what the right arm is doing, or is it an internal struggle for control between modernisers and conservatives?
Whatever the explanation, Qatar's Jekyll-and-Hyde approach to journalism has been exposed by the spotlight that has been thrown on it after winning the World Cup bid.
Other journalists and activists, including a German TV crew, have also recently been detained.
How the country handles the media, as it prepares to host one of the world's most watched sporting events, is now also becoming a concern.
Mustafa Qadri, Amnesty International's Gulf migrant rights researcher, told us the detentions of journalists and activists could be attempts "to intimidate those who seek to expose labour abuse in Qatar".
Qatar, the world's richest country for its population size of little more than two million people, is pouring money into trying to improve its reputation for allowing poor living standards for low-skilled workers to persist.
Inside Qatar's squalid labour camps
A highly respected London-based PR firm, Portland Communications, now courts international journalists. On the day we left prison, it showed us spacious and comfortable villas for construction workers, with swimming pools, gyms and welfare officers.
This was part of the showcase tour of workers' accommodation, and it was organised by the prime minister's office.
Qatar's World Cup organising committee, which answers to Fifa, was helping to run the tour.
Fifa says it is now investigating what happened to us. It has issued the following statement: "Any instance relating to an apparent restriction of press freedom is of concern to Fifa and will be looked into with the seriousness it deserves."
Following our detention, the minister of labour agreed to talk to us on camera about how the media can cover what human rights campaigners have identified as "forced labour" within his country.
"Qatar is an open country forever, since ever," Abdullah al-Khulaifi said.
"The shortcomings that I am facing, the problems I am facing, I cannot hide. Qatar is open and now with the smartphones, everyone is a journalist," he said.
He said the negative coverage of migrant workers' conditions was wildly overblown and that much progress had been made to improve basic conditions for migrant workers.
The government has implemented a wage protection scheme. It says at least 450 companies have been banned from working in the country and more than $6m (Â£3.8m) of fines have been handed out to firms mistreating workers, and the number of inspectors has been doubled.
Workers are now ferried to and from work in buses, not lorries.
But change has not come easily in what one security guard privately described to me as a country with surveillance officers everywhere.
Without trade unions or a free media, bosses of large domestic and international companies have little incentive to radically improve conditions for well over a million labourers desperate for money.
Before we were detained, I met an 18-year-old mechanic, one of the 400,000 Nepalese workers there.
He said he wanted to support his older brothers because his father had died and the family was struggling financially.
He paid a recruitment agency in Nepal $600 to arrange his visa to work in Qatar and was told he would earn $300 a month.
When he arrived he was told his salary, as a labour camp cleaner for air conditioning mechanics, was in fact $165 a month. He said he has never been given a copy of the contract he signed. Worse still, he said he could not understand it as it was in English.
It's a very common trick that foreign recruitment agents play before workers even get to Qatar, and very difficult for Qatar itself to police, although it says it is trying.
This young man now finds himself at the mercy of Qatar's restrictive kafala system, which prevents workers from changing jobs for five years. Being tied to an employer in that way can leave migrant workers open to exploitation.
However, with so much money needed for rebuilding decimated parts of Nepal, there will be no shortage of future volunteers.
And as Qatar's World Cup approaches, the focus on migrant labour is only likely to increase.
UPDATE, 25 May: After three weeks of asking the authorities to return our equipment, alongside pressure from Fifa, diplomats and politicians, it is now back in our hands. Intelligence officers have wiped the video footage from our memory cards and the translator's phone is broken.


A warrant has been issued for former Celtic footballer Islam Feruz after he failed to turn up for a court appearance in Glasgow.

The 20-year-old had been due to go on trial for allegedly driving an Â£80,000 Porsche while banned.
He has also been accused of attempting to pervert the course of justice and driving without insurance.
At Glasgow's Justice of the Peace Court, it was said Mr Feruz was in training in Tanzania.
Sheriff Frances McCartney issued a warrant for his arrest.
The Somalia-born player joined Celtic as a 10-year-old. The club had successfully campaigned for him and his family to be allowed to stay in Scotland.
He moved to Chelsea six years later and has had loan spells with a number of clubs, including Hibs.


Thousands of pro-life demonstrators have taken to the streets of Belfast city centre in an anti-abortion rally.

They marched from Custom House Square to the city hall and back.
Organisers said they were delighted with the turn-out. A small group of pro-choice demonstrators gathered at the front of the city hall in protest.
The pro-life protest was over proposed changes to Northern Ireland's abortion laws.
The laws covering abortion in Northern Ireland are the 1861 Offences against the Person Act, and the Criminal Justice Act 1945.
Terminations are only permitted to save a woman's life, or if there is a risk of permanent and serious damage to her mental or physical health.
Northern Ireland's Justice Minister David Ford has said he is going to consult on changing abortion laws to allow women carrying babies with fatal foetal abnormalities to have a termination.
The protest on Saturday was against that.
Among the demonstrators was singer Dana Rosemary Scallon.
"It's a great turnout, it's a celebration of life and these people want to protect life at all its stages," she said.
"No outside force should ever force the people of any sovereign nation to change their laws or in any way to bring in agendas that the people are not in agreement with."
The pro-choice group said they held their protest to show there was an alternative view.
"I believe that a woman who has an unplanned pregnancy or an unwanted pregnancy in Northern Ireland should have the same access to abortion as every other sister in the United Kingdom," the group's Brenda Callaghan said.


The European Union (EU) has summoned the Gambian ambassador for an explanation after its representative to the country was expelled.

The EU is astonished by the move, which appeared to have no justification, a spokeswoman said.
Agnes Guillaud has 72 hours to leave the country, without getting a reason.
The EU has been critical of The Gambia's human rights record, particularly regarding its laws penalising homosexuality.
Last year the EU blocked nearly $15m in aid to The Gambia.
President Yahya Jammeh, 50, has governed the small west African nation with a firm hand since he came to power in a coup 20 years ago.
He has crushed dissent and faces mounting international criticism over issues ranging from human rights to his stated belief that he can cure Aids.
The president has also implemented tough measures against Gambia's lesbian, gay, bisexual and transgender community. He has called gay people "vermin" and has threatened to slit their throats.
Homosexual acts are illegal in The Gambia. MPs passed a bill last August imposing life sentences for "aggravated homosexuality".
The EU summoned the Gambian ambassador on Saturday to seek an explanation for the expulsion, officials said.
"There appears to be no justification for the decision by the Gambian authorities. We are astonished by this announcement which came with no explanations," a spokeswoman said.
The Gambia has accused both the US and the EU of conducting a campaign to besmirch the image of the country because of its position against homosexuality.
"The government reminds all that homosexuality is totally against the religious, cultural and traditional values of The Gambia and would thus not be tolerated," a statement from President Jammeh's office said on Friday.


The Colombian army and Farc guerrillas have begun working together to clear landmines sown during 50 years of war, the government says.

Officials said they had identified four areas for clearance in the northern region of Antioquia using maps provided by the Farc.
Peace talks have been faltering since the left-wing rebel group suspended a unilateral ceasefire last week.
Colombia is one of the most mine-ridden countries in the world.
There have been almost 11,000 recorded deaths and injuries from landmines since 1990.
The  government's chief peace negotiator in Havana, Humberto de la Calle, said: "Farc handed over a map and actively contributed in the process."
He said decommissioning anti-personnel mines "had become a reality".
The mission, which took place over the course of a week, was the first step in a March agreement towards de-commissioning mines placed during the conflict.
The work focused on a region severely affected by mines.
Mr de la Calle said: "Work started in Antioquia, because it is the department historically with the most incidents of explosions from these objects."
He said the area they had begun to search contained  "more mines than inhabitants".
The joint operation which had been agreed during the last round of peace talks taking place in Havana had been due to begin sooner, but the suspension of a unilateral ceasefire by Farc  last week and the deaths of both army and Farc personnel in various attacks had delayed the start.
The Farc killed 11 soldiers in an ambush last month, causing President Juan Manuel Santos to order new air strikes on rebel positions.
Around 40 rebel fighters have been killed since last week, including two high-ranking commanders.
Mr de la Calle said that he hoped the joint de-mining operation would bring hope for the peace talks.
"Who would have imagined an army sergeant and a Farc explosive expert spending days together exchanging opinions?"  he asked.


The Florida governor has removed a prosecutor from 21 murder cases after she said she would no longer be seeking the death penalty.

Republican Governor Rick Scott said he was reassigning all Aramis Ayala's murder cases because her stance sent an "unacceptable message".
Ms Ayala, a Democrat covering Orlando, cited "legal chaos" as the reason for refusing to pursue execution in the case of a murdered policewoman.
Her decision sparked an outcry.
But there were also some who backed her, and a rally was held in her support last week in the state capital of Tallahassee.
On Monday, Mr Scott said: "State Attorney Ayala's complete refusal to consider capital punishment for the entirety of her term sends an unacceptable message that she is not interested in considering every available option in the fight for justice."
Ms Ayala, an elected prosecutor in central Florida's Ninth Judicial Circuit, accused the governor of abusing his authority and compromising the independence of the judiciary.
She took office in January, to begin a four-year term.
The case that sparked the row involves a man accused of killing an Orlando police officer.
When Ms Ayala said last month she would not consider capital punishment for the accused, Markeith Loyd, the governor removed her from the case.
He handed it to State Attorney Brad King, who will now also take on the 21 other murder cases removed from Ms Ayala on Monday.
Capital punishment has been in limbo in Florida for 15 months.
A US Supreme Court ruling in January 2016 said the state's death penalty was unconstitutional because it gave too much power to judges over juries.
Governor Scott attempted to restart executions last month by signing a bill that requires jury recommendations to be unanimous before a death penalty can be imposed by a judge.


A man who got stuck on a Swansea rooftop trying to capture his missing parrot has been reunited with the bird, an animal charity says.

Fire crews had to step in when the man became stranded on the Penlan Leisure Centre on Tuesday evening.
The pet owner was trying to recover the bird, but it flew off.
The RSPCA said a pineapple conure bird was later discovered at St Helen's Road and is back with its family.
"We believe that this parrot could be the one that we helped to safely return to its owners," said Sally Hyman, chair of the RSPCA at the Llys Nini animal centre.
"If this isn't the same one, there seems to be a spate of escaped parrots in Swansea."
The bird was spotted by a member of the public, who managed to take it to Birdline Parrot Rescue in Swansea. Another animal charity, Glynneath Guinea Pig Rescue then alerted the RSPCA, who in turn put the find up on Facebook.


Greg James has broken Nick Grimshaw's Guinness World twerking record.

The Radio 1 DJ was secretly dancing in a studio nearby while the Breakfast Show host was in the Live Lounge.
Grimshaw, 30, managed to wiggle his hips for over an hour on Tuesday morning but James was doing exactly the same without him knowing anything about it.
Miley Cyrus made twerking famous after dancing with Robin Thicke at last year's MTV VMAs in Brooklyn.
Previously Nick Grimshaw has cycled in a plastic box for 12 hours outside BBC Broadcasting House for Sport Relief.
He also ran with Davina McCall on her 500-mile charity triathlon from Edinburgh to London.
Watch part of Grimmy's previous world record twerk in fast forward.
Nick Grimshaw broke the Guinness World record for 'longest duration twerking' with a time of one hour and 16 seconds live on the Radio 1 Breakfast Show.
Just after he was handed his title, a Guinness World Record official revealed that he had already been beaten.
She said: "I've just been told by a colleague in my ear that one of your colleagues, Mr Greg James, who is currently twerking in front of us, has achieved a time of one hour and eight minutes.
"So your Guinness World record's title has just been broken. I'm very sorry."
"Stop twerking, " Grimmy shouted to Greg.
"I hate you Greg. I've been to twerking lessons on a Saturday for this, " he added.
Greg replied: "I told you revenge was coming and this was the revenge for G In The Park."
"I feel great. Doesn't it feel great to have a world record Grim?"
Watch Greg and Grimmy's World Twerk Off
Follow @BBCNewsbeat on Twitter and Radio1Newsbeat on YouTube


The man who died in a two-car collision in north Wales has been named as 19-year-old Trystan Rhun Roberts.

The fire service apprentice mechanic died in the collision on the A5 in Capel Curig in Snowdonia on Tuesday.
North Wales chief fire officer Simon Smith said: "Today our thoughts are with everyone affected by this incident, but particularly with the family of the colleague we have lost."
Support has been offered to staff.
Mr Roberts was based at the fire service's fleet department at Llandudno Junction, Conwy county.
Mr Smith said: "Our service attends road traffic collisions often and they are always difficult for our staff to deal with, but even more so when they involve a close colleague."
The crash, near the Siabod Cafe, involved Mr Roberts' red Seat Leon and a silver Mercedes car.
North Wales Police has appealed for witnesses.


Local elections are being held in North Korea - the first since ruler Kim Jong-un came to power in 2011.

It is the joint-most corrupt country in the world with Somalia, according to Transparency International, and the same family has ruled since 1948.
So why is it holding elections? And how reliable are they?
Local elections have been held in North Korea since 1999 - let's not forget that the country's full name is, technically, the Democratic People's Republic of Korea (DPRK).
Sunday's elections are to decide provincial governors, mayors and local assemblies in the country of almost 25m people.
The number of seats is determined by each district's population.
In the second provincial elections in 2003, one report said 26,650 "officials, workers, peasants and intellectuals" were elected.
The choice is limited - there is only one candidate on the ballot in each district, and while the selection of candidates is made by the governing coalition, they are closely overseen by Kim Jong-un's Workers' Party.
Ahead of last year's elections to name deputies for the country's assembly, The Economist reported that voting did not take place in secret, and any dissenting votes must be placed in a separate ballot box.
Abstaining or voting no are considered acts of treason.
In the last local election, in 2011, there was a turnout of 99.7%, with the state news agency saying those unable to vote were abroad or on the high seas.
Having such a high reported turnout has its advantages for the state, observers say, in that it acts as an informal census.
"The government checks the list of voters and if your name is not on the list, they will investigate it", one North Korean defector told the NK News website.
"It is often during election that the government finds out about defectors and people who have been missed."
If the state works out you did not vote, NK News says, "you and your family are in trouble".
Sunday's elections do not decide the leadership of the country.
Parliamentary elections are also held in North Korea, and they decide who rules the country - which is always a foregone conclusion.
Kim Jong-un won in the last parliamentary election in 2014 - gaining 100% of the vote in his Mount Paektu constituency.