A dog trainer works with a previously abandoned dog at a police centre in Saltillo, Mexico March 4, 2016. Stray dogs are adopted by the police from a municipal anti-rabies centre and then trained to help the police patrol the streets, and search for drugs, explosives and weapons. Picture taken March 4, 2016. REUTERS/Daniel Becerril 

Football Soccer - Southampton v Sunderland - Barclays Premier League - St Mary's Stadium - 5/3/16
Sunderland's manager Sam Allardyce
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A migrant walks in the southern part of a camp for migrants called the "jungle", in Calais, northern France, February 25, 2016. The administrative tribunal in regional capital Lille was to decide whether closing part of the site would violate human rights after several local charities and migrants requested a temporary injunction to halt the planned evacuation. REUTERS/Pascal Rossignol

A demonstrator holds a sign during a protest against the FBI's request to extract data from iPhones in cases across the country, outside the Apple Store in New York February 23, 2016. REUTERS/Shannon Stapleton TPX IMAGES OF THE DAY

Migrants stand behind a border fence at the Greek-Macedonian border, after additional passage restrictions imposed by Macedonian authorities left hundreds of them stranded near the village of Idomeni, Greece, February 23, 2016. The picture was taken from the Macedonian side of the border. REUTERS/Marko Djurica 

Brian Easton (left) and Brad Stepp, are two of 1,400 workers at Carrier Corporation (building in background) in Indianapolis, Indiana, February 17, 2016. Easton and Stepp stand to lose their job when the company moves production to Mexico. The Feb 9 announcement by United Technologies Corp's Carrier unit that it was shifting production to Mexico from the U.S. has thrust the long-term trend of U.S. manufacturing job decline to the foreground of the nation's election year agenda. Picture taken February 17, 2016. REUTERS/Nick Carey 

Football Soccer - Paris St Germain v Chelsea - UEFA Champions League Round of 16 First Leg - Parc des Princes, Paris, France - 16/2/16
Chelsea's Oscar before the game
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Football Soccer - Paris St Germain v Chelsea - UEFA Champions League Round of 16 First Leg - Parc des Princes, Paris, France - 16/2/16
Chelsea's Oscar before the game
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Football Soccer - Paris St Germain v Chelsea - UEFA Champions League Round of 16 First Leg - Parc des Princes, Paris, France - 16/2/16
Chelsea's Oscar before the game
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Migrants walk towards a makeshift camp close to the Austrian border town of Spielfeld in the village of Sentilj, Slovenia, February 16, 2016. REUTERS/Leonhard Foeger 

A migrant boy waits to cross the border from Slovenia into Spielfeld in Austria, February 16, 2016. REUTERS/Leonhard Foeger

A family member of an inmate shouts while standing outside the Topo Chico prison in Monterrey, Mexico, February 11, 2016. Fifty-two people were killed and twelve people were wounded in a prison riot in Monterrey in the northeastern Mexican state of Nuevo Leon, governor Jaime Rodriguez said in a news conference on Thursday. REUTERS/Daniel Becerril 

A family member of an inmate stands outside the Topo Chico prison in Monterrey, Mexico, February 11, 2016. Fifty-two people were killed and twelve people were wounded in a prison riot in Monterrey in the northeastern Mexican state of Nuevo Leon, governor Jaime Rodriguez said in a news conference on Thursday. REUTERS/Daniel Becerril 

Family members of inmates stand outside the Topo Chico prison in Monterrey, Mexico, February 11, 2016. Dozens of people were killed in a riot in a prison in northeastern Mexico early on Thursday, local media reported, the just days ahead of a planned visit by Pope Francis to another prison near in Mexico's far north. REUTERS/Daniel Becerril

Five-year old Sheima, who lost both eyes when hit by a stray bullet in Syria, sits on her hospital bed in a small clinic near the Turkish-Syrian border in the southeastern city of Kilis, Turkey February 9, 2016. REUTERS/Osman Orsal TPX IMAGES OF THE DAY 

A young carnival reveller uses an umbrella after the "Rosenmontag" (Rose Monday) parade, the highlight of the annual carnival season, was called-off in Mainz, Germany, February 8, 2016. Many traditional Rose Monday carnival parades were cancelled in the Rhineland due to severe weather warnings. Low-pressure system Ruzica, bringing heavy thunderstorms and high winds is predicted for Monday, according to the weather department. REUTERS/Kai Pfaffenbach

Brothers Zhang Guantian (R), 23, and Zhang Guanzhou, 21, wait for a bus that will take them home for the annual Chinese New Year holiday, at a bus station in Dongguan, southern China February 1, 2016. As China's economy hits its slowest growth in 25 years, businesses are finding ever more cash tied up in unsold stock and unpaid invoices as industry shirks the pain of trimming capacity and struggling customers take longer to pay. Picture taken February 1, 2016. REUTERS/James Pomfret

Syrian refugees children watch as Britain's Foreign Secretary Philip Hammond visits Al Zaatari refugee camp in the Jordanian city of Mafraq, near the border with Syria, February 1, 2016. REUTERS/ Muhammad Hamed

A man uses a cane while walking outside his house in Sra Ouertane, in the hills south of Kef Governorate, Tunisia January 31, 2016. REUTERS/Zohra Bensemra 

2.5-year-old Wei Yangkun is carried by his mother as they leave Beijing Railway Station for their hometown Xinyang of Henan province, in Beijing, China, January 25, 2016. According to traffic police, over 2.9 billion trips will be made around China during the 40-day Spring Festival travel rush, which started on January 24. REUTERS/Jason Lee 

A woman takes pictures along Riverside Drive after a winter storm in Manasquan, New Jersey, January 24, 2016. A morning high tide surge of 2 feet followed snowfall of about 2 feet in the first major storm of the season. REUTERS/Dominick Reuter 

A Palestinian boy looks out of a shop window on a rainy day in Beit Hanoun in the northern Gaza Strip, January 24, 2016. REUTERS/Mohammed Salem

Palestinian boys sit on a sidewalk on a rainy day in Beit Hanoun in the northern Gaza Strip, January 24, 2016. REUTERS/Mohammed Salem

A fire fighter helps a hiker on icy gound under sub-zero temperatures at Tai Mo Shan, the highest mountain in Hong Kong, China January 24, 2016. Government radio reported on Sunday that Hong Kong Observatory said it was the coldest day in 59 years, with the temperature dropping to 3.3 degrees in urban areas. REUTERS/Bobby Yip 

Steam fills the glasses of a hiker under sub-zero temperatures at Tai Mo Shan, the highest mountain in Hong Kong, China January 24, 2016. Government radio reported on Sunday that Hong Kong Observatory said it was the coldest day in 59 years, with the temperature dropping to 3.3 degrees in urban areas. REUTERS/Bobby Yip 

A hiker walks past icy plants under sub-zero temperatures at Tai Mo Shan, the highest mountain in Hong Kong, China January 24, 2016. Government radio reported on Sunday that Hong Kong Observatory said it was the coldest day in 59 years, with the temperature dropping to 3.3 degrees in urban areas. REUTERS/Bobby Yip TPX IMAGES OF THE DAY

Hikers are covered with ice under sub-zero temperatures at Tai Mo Shan, the highest mountain in Hong Kong, China January 24, 2016. Government radio reported on Sunday that Hong Kong Observatory said it was the coldest day in 59 years, with the temperature dropping to 3.3 degrees in urban areas. REUTERS/Bobby Yip TPX IMAGES OF THE DAY

A Sbarro restaurant worker holds a banner that reads "Sbarro, return our money!", during a protest over a months-long delay in the payment of wages in Moscow, Russia, January 20, 2016. REUTERS/Maxim Shemetov 

Sbarro restaurant workers protest against months-long delays in payment of their wages in Moscow, Russia, January 20, 2016. REUTERS/Maxim Shemetov 

Ahmed Manasra, a 13-year-old Palestinian, waits with his aunt before a court session at the District Court in Jerusalem January 19, 2016. Israeli police have accused Manasra, together with his 15-year-old cousin, of attacking a 13-year-old Israeli boy on October 12, 2015 in Pisgat Zeev, built on occupied land that Israel annexed to Jerusalem after the 1967 war. The family has denied Manasra did it. REUTERS/Ammar Awad 

Football Soccer - Swansea City v Watford - Barclays Premier League - Liberty Stadium - 18/1/16
Swansea's Ashley Williams before the match
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A child cries from the cold at a registration camp for migrants in Presevo, Serbia, January 17, 2016. REUTERS/Marko Djurica 

A child cries from the cold at a registration camp for migrants in Presevo, Serbia, January 17, 2016. REUTERS/Marko Djurica 

Football Soccer - Liverpool v Arsenal - Barclays Premier League - Anfield - 13/1/16
Liverpool manager Juergen Klopp
Reuters / Phil Noble
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Football Soccer - Southampton v Watford - Barclays Premier League - St Mary's Stadium - 13/1/16
Southampton manager Ronald Koeman
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Football Soccer - Aston Villa v Crystal Palace - Barclays Premier League - Villa Park - 12/1/16
Crystal Palace manager Alan Pardew
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A man walks into an asylum shelter, where a man who was shot dead at a police station in Paris after a foiled attack on Thursday lived, in Recklinghausen, Germany January 10, 2016. REUTERS/Ina Fassbender 

A man walks into an asylum shelter, where a man who was shot dead at a police station in Paris after a foiled attack on Thursday lived, in Recklinghausen, Germany January 10, 2016. REUTERS/Ina Fassbender 

A man walks into an asylum shelter, where a man who was shot dead at a police station in Paris after a foiled attack on Thursday lived, in Recklinghausen, Germany January 10, 2016. REUTERS/Ina Fassbender 

A man walks into an asylum shelter, where a man who was shot dead at a police station in Paris after a foiled attack on Thursday lived, in Recklinghausen, Germany January 10, 2016. REUTERS/Ina Fassbender 

Football Soccer - Stoke City v Liverpool - Capital One Cup Semi Final First Leg - Britannia Stadium - 5/1/16
Liverpool manager Juergen Klopp
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Football Soccer - Stoke City v Liverpool - Capital One Cup Semi Final First Leg - Britannia Stadium - 5/1/16
Liverpool manager Juergen Klopp
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Football Soccer - Stoke City v Liverpool - Capital One Cup Semi Final First Leg - Britannia Stadium - 5/1/16
Liverpool manager Juergen Klopp
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Football Soccer - Stoke City v Liverpool - Capital One Cup Semi Final First Leg - Britannia Stadium - 5/1/16
Liverpool manager Juergen Klopp
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Football Soccer - Stoke City v Liverpool - Capital One Cup Semi Final First Leg - Britannia Stadium - 5/1/16
Liverpool manager Juergen Klopp
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Football Soccer - Stoke City v Liverpool - Capital One Cup Semi Final First Leg - Britannia Stadium - 5/1/16
Liverpool manager Juergen Klopp reacts
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Football Soccer - Stoke City v Liverpool - Capital One Cup Semi Final First Leg - Britannia Stadium - 5/1/16
Liverpool manager Juergen Klopp celebrates after Jordon Ibe scored their first goal
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Football Soccer - Stoke City v Liverpool - Capital One Cup Semi Final First Leg - Britannia Stadium - 5/1/16
Liverpool manager Juergen Klopp celebrates after Jordon Ibe scored their first goal
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Football Soccer - Stoke City v Liverpool - Capital One Cup Semi Final First Leg - Britannia Stadium - 5/1/16
Liverpool manager Juergen Klopp
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Football Soccer - Stoke City v Liverpool - Capital One Cup Semi Final First Leg - Britannia Stadium - 5/1/16
Liverpool manager Juergen Klopp
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A man walks along a road during the season's first major snowfall in Srinagar, India January 4, 2016. REUTERS/Danish Ismail 

An injured Sunni Muslim rebel fighter who was trapped with other fighters in Zabadani, arrives at Bab al-Hawa near the Syrian-Turkish border December 29, 2015. A U.N. operation to evacuate around 450 Syrian fighters and their families from two besieged Syrian areas was completed on Monday with the arrival of planes carrying them to Beirut and Hatay airport in Turkey, U.N. and airport sources said. REUTERS/Ammar Abdullah 

A woman poses for a photo in front of Snoqualmie Falls after recent storms increased water flow in Snoqualmie, Washington, December 10, 2015. Residents of the U.S. Pacific Northwest were hit by fresh storms on Thursday after the region received record-breaking rainfall that left two dead in Oregon and triggered widespread flooding, landslides, road closures and power cuts. REUTERS/Jason Redmond 

A woman wearing a protective mask has her picture taken just after a flag-raising ceremony amid heavy smog at the Tiananmen Square, after the city issued its first ever "red alert" for air pollution, in Beijing December 9, 2015. REUTERS/Damir Sagolj 

Hooded youth walk amidst tear gas smoke during clashes with clashes with riot police, following an anniversary rally marking the 2008 police shooting of 15-year-old student, Alexandros Grigoropoulos, in Athens, Greece, December 6, 2015. REUTERS/Alkis Konstantinidis 

Students carry backpacks with logos of Manchester United Football Club (L) and Royal Madrid Football Club while looking at photos of famous soccer players at Evergrande soccer academy in Qingyuan, southern China December 3, 2015. Picture taken December 3. REUTERS/Tyrone Siu TPX IMAGES OF THE DAY

Students watch in the rain during a training session at Evergrande soccer academy in Qingyuan, southern China December 3, 2015. Picture taken December 3. REUTERS/Tyrone Siu 

A woman wearing a protective mask walks as smog covers China's capital Beijing on an extremely polluted day, December 1, 2015. REUTERS/Jason Lee TPX IMAGES OF THE DAY

A woman wearing a protective mask walks along a traditional alleyway, or hutong, as smog covers China's capital Beijing on an extremely polluted day, December 1, 2015. REUTERS/Jason Lee 

A man wearing a protective mask walks as smog covers China's capital Beijing on an extremely polluted day, December 1, 2015. REUTERS/Jason Lee