Firefighters attend to a fire in a multi-family apartment building on May 20, 2014 in the Brooklyn borough of New York City. York. Two people suffered minor injuries in the early morning fire that left numerous families homeless after the blaze moved through the fourth and fifth floors. (Photo by Spencer Platt/Getty Images)

Palestinians carry a wounded protester during clashes with Israeli troops over the controversial Israeli barrier in Kfar Aqab near the West Bank city of Ramallah May 19, 2014. (Photo by Mohamad Torokman/Reuters)

North Korean leader Kim Jong Un smiles during a visit to Taesongsan General Hospital in this undated photo released by North Korea's Korean Central News Agency (KCNA) in Pyongyang May 19, 2014. (Photo by Reuters/KCNA)

“Free Syrian Army” fighters prepare an improvised explosive to fire towards forces loyal to Syria's President Bashar al-Assad, in Aghyour area in the city of Aleppo May 22, 2014. (Photo by Abdalrhman Ismail/Reuters)

“Free Syrian Army” fighters fire a self-made rocket towards forces loyal to Syria's President Bashar al-Assad in Bustan al-Basha district in Aleppo May 19, 2014. (Photo by Hosam Katan/Reuters)

Injured Syrian children rest on a bed as they wait for treatment following a reported shelling on the Hamra neighbourhood of the northern Syrian city of Aleppo on May 21, 2014. (Photo by Zein Al-Rifai/AFP Photo)

German armed forces Bundeswehr soldiers fire mortars during the JAWTEX 2014 (Joint Air Warfare Tactical Exercise) at an army training area in Bergen, May 20, 2014. About 4500 soldiers from eleven countries take part at the largest European military exercise in 2014. (Photo by Fabrizio Bensch/Reuters)

Security personnel stand guard as US Vice President Joe Biden's plane approaches Larnaca airport, Cyprus, 21 May 2014. Biden arrived in Cyprus for a two-days visit. (Photo by Katia Christodoulou/EPA)

Russian President Vladimir Putin attends a gala dinner ahead of the fourth Conference on Interaction and Confidence Building Measures in Asia (CICA) summit, in Shanghai May 20, 2014. (Photo by Aly Song/Reuters)

A man portraying a Civil War soldier from the South fires a cannon during Civil War Days at Naper Settlement in Naperville, Illinois, May 17, 2014. Participants dress in period costumes to recreate a battle scene from the war that took place in the United States from 1861-1865.. (Photo by Jim Young/Reuters)

Druz residents take pictures beside photojournalists in a celebration to solidify the reconciliation between Christians and Druze in Brih May 17, 2014. (Photo by Mohamed Azakir/Reuters)

People sit at an oversize picnic table in Soho Square in London May 19, 2014. (Photo by Luke MacGregor/Reuters)

A man dressed as an orangutan sits next to members of the press during media day at the Chelsea Flower Show in London May 19, 2014. (Photo by Stefan Wermuth/Reuters)

Britain's Prince Charles (L) greets men dressed as fruits and vegetables during a visit to the Military Family Resource Centre in Halifax, Nova Scotia, May 19, 2014. The men are part of a program at the centre that promotes healthy eating for childrren. The royal couple are on a four-day visit to Canada that begins in Halifax and includes stops in Pictou, Nova Scotia, the Prince Edward Island towns of Charlottetown, Bonshaw and Cornwall and concludes in Winnipeg. (Photo by Mark Blinch/Reuters)

Prince Charles and Camilla, Duchess of Cornwall, watch traditional dancers in Halifax, Nova Scotia, on May 19, 2014. (Photo by Mark Blinch/Reuters)

A train conductor stands at a door of a damaged railway car at the site of train collision near the city of Naro-Fominsk outside Moscow Tuesday May 20, 2014. The Interior Ministry said the accident happened when several cars of a cargo train derailed and hit a passenger train near Naro-Fominsk, a town 50 kilometers (30 miles) southwest of Moscow. (Photo by Pavel Golovkin/AP Photo)

Sudanese Armed Forces (SAF) and Rapid Support Forces (RSF) personnel ride on a tank after recapturing the Daldako area, outside the military headquarters in Kadogli May 20, 2014. The SAF had recaptured the Daldako area, east of the South Kordofan state capital of Kadogli, from rebels, according to media reports quoting the SAF on Sunday. (Photo by Mohamed Nureldin Abdallah/Reuters)

Students of the Krasnoyarsk choreographic college prepare backstage before a dress rehearsal of a performance by graduates of the college at the State Theatre of Opera and Ballet in Russia's Siberian city of Krasnoyarsk, May 20, 2014. The annual performance showcases the work of students from across Russia who study or have studied at the well-known school. (Photo by Ilya Naymushin/Reuters)

A light show featuring a ballet dancer and swans from Swan Lake is projected onto spraying water by the Vivid Aquatique Water Theatre during a preview of the Vivid Sydney light and music festival May 21, 2014. For 18 days beginning on May 23 the Vivid Sydney festival, one of the world's largest creative industry forums, will combine outdoor lighting sculptures and installations. (Photo by Jason Reed/Reuters)

A vigilante group of traditional hunters pose for a photo at their camp in Maiduguri, Nigeria, on May 21, 2014. About 100 traditional hunters from villages in Borno state have gathered in a camp in Maiduguri and volunteered to hunt for the Islamist extremist group Boko Haram to help the local government. (Photo by Joe Penney/Reuters)

Commuters are reflected as they walk, while work continues on a new PATH terminal designed by Santiago Calatrava near Ground Zero in New York May 21, 2014. (Photo by Lucas Jackson/Reuters)

Demonstrators clash with police during a protest at McDonald's headquarters in Oak Brook, Illinois, May 21, 2014. Workers were calling for higher wages and better work conditions. (Photo by Jim Young/Reuters)

Operators from 17 countries participate in an International Special Operations Exercise at SOFIC, the Special Operations Forces Industry Conference, in Tampa, Florida, May 21, 2014. SOFIC provides a forum for domestic and foreign military personnel, governments and industry professionals to network and discuss challenges related Special Operations Forces around the globe. (Photo by Brian Blanco/Reuters)

TV personality Kim Kardashian and rapper Kanye West arrive at a fashion designer workshop in Paris May 21, 2014. U.S. television personality Kim Kardashian and rapper Kanye West will celebrate their wedding in Florence on May 24, an official from the mayor's office confirmed on Friday. (Photo by Gonzalo Fuentes/Reuters)

A man gestures in front of a burning barricade during a protest against French soldiers in Bambari May 22, 2014. At least three people were killed in the Central African Republic on Thursday as Muslims with machetes and rifles clashed with French peacekeeping troops trying to disarm rebels, a rebel spokesman said. (Photo by Goran Tomasevic/Reuters)

President Obama greets the crowd that gathered to watch him arrive at Griffiss International Airport in Rome, N.Y., on May 22, 2014. Obama highlighted the tourism industry during a visit to the National Baseball Hall of Fame in Cooperstown, N.Y., before flying to Chicago to speak at Democratic Party events. (Photo by Jonathan Ernst/Reuters)