A Sultan Murad brigade fighter (L), part of the Free Syrian Army, stands next to men they have taken as prisoners who used to fight with the Democratic Forces of Syria, in Aleppo, Syria, February 16, 2016. REUTERS/Abdelrahmin Ismail

Handler Valerie Nunez Atkinson runs with CJ, a German Shorthaired Pointer from the Sporting Group that won Best in Show, at the Westminster Kennel Club Dog show at Madison Square Garden in New York February 16, 2016. REUTERS/Brendan McDermid TPX IMAGES OF THE DAY

Emergency services workers search a house that collapsed after explosions at an LPG gas distribution station in Santo Domingo, Dominican Republic, February 16, 2016. At least 40 people were injured and the cause of the explosions is still being investigated, according to rescue services. REUTERS/Ricardo Rojas TPX IMAGES OF THE DAY

Trucks are seen on a highway near the Kulata border crossing between Bulgaria and Greece, Bulgaria February 17, 2016. Bulgarian truckers staged a counter-blockade on Tuesday at a checkpoint on the country's border with Greece, after Greek protesters failed to keep a promise to lift their own blockade for a few hours a day. REUTERS/Stoyan Nenov TPX IMAGES OF THE DAY

Democratic U.S. presidential candidate Hillary Clinton is introduced by U.S. Representative Charles Rangel (D-NY) (L) as she is applauded by New York City Mayor Bill de Blasio (back L) and New York Governor Andrew Cuomo (back R) for her address at the The Schomburg Center for Research in Black Culture in the Harlem section of New York City, February 16, 2016. REUTERS/Mike Segar TPX IMAGES OF THE DAY

A supporter of Kashmiri lawmaker Sheikh Abdul Rashid, also known as Engineer Rashid, attempts to jump from a police vehicle after he was detained by Indian police during a protest in Srinagar February 17, 2016. Dozens of supporters of Rashid were detained by police on Wednesday during a protest against the arrest of former Delhi University lecturer (SAR) Syed Abdul Rehman Geelani and also against the deaths of two youths in south Kashmir's Pulwama district, protesters said. REUTERS/Danish Ismail TPX IMAGES OF THE DAY

A man shovels snow during a winter storm in Ottawa, Canada, February 16, 2016. REUTERS/Chris Wattie TPX IMAGES OF THE DAY

Pope Francis hugs two girls during a meeting with youths at the Jose Maria Morelos y Pavon stadium in Morelia, Mexico, February 16, 2016. REUTERS/Carlos Garcia Rawlins TPX IMAGES OF THE DAY

U.S. Republican presidential candidate Jeb Bush (2nd R) walks past a security guard with a sidearm and a tattoo of the start of the preamble to the U.S. constitution, "We the people," after a town hall meeting with employees at FN America gun manufacturers in Columbia, South Carolina February 16, 2016. REUTERS/Jonathan Ernst

A woman walks past electoral campaign posters for presidential candidate Seini Oumarou in Niamey, Niger, February 16, 2016. Niger holds presidential and legislative elections on Sunday. REUTERS/Joe Penney TPX IMAGES OF THE DAY

U.S. Republican presidential candidate Donald Trump walks down the street accompanied by U.S. Secret Service agents as he arrives at his campaign headquarters in Greenville, South Carolina February 16, 2016. REUTERS/Rainier Ehrhardt TPX IMAGES OF THE DAY

U.S. F-22 stealth fighter jets fly over Osan Air Base in Pyeongtaek, South Korea, February 17, 2016. REUTERS/Kim Hong-Ji TPX IMAGES OF THE DAY

Sara Carcache (R), 40, sits with her daughter Saidy as her mother Candida Estrada, 76, looks to the camera beside a 1970 Ukrainian made tractor in Caimito, Cuba, February 15, 2016. The U.S. government has granted an Alabama company permission to build tractors in Cuba, one of the company's co-owners said on Monday, making it potentially the first American manufacturer to open shop in Cuba since the 1959 revolution. REUTERS/Alexandre Meneghini

A woman walks with an umbrella in the rain past a U.S. flag painted on a building in the Manhattan borough of New York, February 16, 2016. REUTERS/Carlo Allegri TPX IMAGES OF THE DAY

U.S. President Barack Obama (C) is flanked by leaders from the 10-nation Association of Southeast Asian Nations (ASEAN) summit during a group photo opportunity in Rancho Mirage, California, February 16, 2016. REUTERS/Kevin Lamarque TPX IMAGES OF THE DAY

The bench of late Supreme Court Justice Antonin Scalia is seen draped with black wool crepe in memoriam inside the Supreme Court in Washington February 16, 2016. REUTERS/Carlos Barria TPX IMAGES OF THE DAY

Pope Francis is seen in a car as he arrives at the Apostolic Nunciature in Mexico City February 16, 2016. REUTERS/Carlos Jasso TPX IMAGES OF THE DAY

Migrants walk along a train upon their arrival at a makeshift train station close to the Austrian border town of Spielfeld in the village of Sentilj, Slovenia, February 16, 2016. REUTERS/Leonhard Foeger TPX IMAGES OF THE DAY

Erica Garner, daughter of Eric Garner, a black man choked to death by a police officer last year, raises her hand to ask U.S. Democratic presidential candidate Bernie Sanders a question at a town hall campaign event in Columbia, South Carolina, United States, February 16, 2016. REUTERS/Jim Young TPX IMAGES OF THE DAY

Nuns participate in a Mass by Pope Francis (not pictured) at Venustiano Carranza stadium in Morelia, Mexico February 16, 2016. REUTERS/Max Rossi TPX IMAGES OF THE DAY