People throw colorful powder during the Holi Festival of Colours in Hamburg, northern Germany, on May 10, 2014. Originally, the festival was celebrated in north India by throwing colorful powers onto each other to celebrate spring and to drive away evil spirits. (Photo by Daniel Reinhardt/AFP Photo/DPA)

Female members of the Palestinian presidential guard take part in a training session given by French GIGN gendarme in the West Bank city of Jericho, on May 12, 2014. (Photo by Thomas Coex/AFP Photo)

Protesters from the neo-Nazi party Danish National Socialist Movement (DNSB) and protestors from the left-wing group Racism Free City clash at Christiansborg Palace Square May 10, 2014. Police had to make several arrests. (Photo by Bax Lindhardt/AFP Photo)

An anti-government demonstrator fires a homemade rocket during confrontations with riot police during a protest against the government of President Nicolas Maduro in Caracas on May 14, 2014. About 80 demonstrators were arrested during a protest as they request the immediate release of youth detained in recent days. (Photo by Gerardo Caso/AFP Photo)

A US army soldiers of the second Squadron 28th Cavalry Regiment (2-38th) part of the NATO-led peacekeeping mission in Kosovo jump with parachutes during a US military drill near the town of Gjakova on May 12, 2014. (Photo by Armend Nimani/AFP Photo)

National Guard personnel in riot gear arrest students during an anti-government demonstration in Caracas on May 14, 2014. (Photo by Gerardo Caso/AFP Photo)

Buddhist devotees release hundreds of lamps during a ceremony in the ancient Borobudur temple which is decorated with 72 Buddha statues in Magelang, Central Java province, on May 15, 2014 as Indonesia's relegious minority celebrate Buddha day. Buddhists are celebrating Vesak, which commemorates the birth of Buddha, his attaining enlightenment and his passing away on the full moon day of May which falls on May 14 this year. (Photo by AFP Photo/STR)

Photo taken on May 14, 2014 shows a person identified by Turkish media as Yusuf Yerkel, advisor to Turkish Prime Minister Recep Tayyip Erdogan, kicking a protester already held by special forces police members during Erdogan's visit to Soma, Turkey. Erdogan was visiting the western Turkish mining town of Soma after Turkey's worst mining accident. (Photo by AFP Photo/Depo Photos)

A man holds a line of Buddhist flags while decorating a pandal at a temple ahead of Vesak Day celebrations in Colombo May 13, 2014. Vesak Day, which is celebrated on May 14 and 15 in Sri Lanka, commemorates the birth, enlightenment and death of Buddha. (Photo by Dinuka Liyanawatte/Reuters)

Sara Errani of Italy hits a return to Chanelle Scheepers of South Africa during their women's singles match at the Rome Masters tennis tournament May 13, 2014. (Photo by Max Rossi/Reuters)

A man looks out of his window surrounded by a recently created graffiti depicting the Kremlin, Russia's President Vladimir Putin and the Russian flag, on the wall of a residential building in the Crimean port of Sevastopol May 13, 2014. (Photo by Reuters/Stringer)

This undated handout photo provided by NASA shows the Thwaites Glacier in West Antarctic. The huge West Antarctic ice sheet is starting a glacially slow collapse in an unstoppable way, two new studies show. Alarmed scientists say that means even more sea level rise than they figured. The worrisome outcomes won’t be seen soon. Scientists are talking hundreds of years, but over that time the melt that has started could eventually add 1.2 to 3.6 metres to current sea levels. A NASA study looking at 40 years of ground, airplane and satellite data of what researchers call “the weak underbelly of West Antarctica” shows the melt is happening faster than scientists had predicted, crossing a critical threshold that has begun a domino-like process. (Photo by AP Photo/NASA)

French special Police forces patrol a residential building area in the Meinau suburb of Strasbourg, May 13. 2014. Interior Security (DGSI) services reinforced by special RAID and GIPN intervention forces conducted early morning raids to arrest six alleged djihadists who travelled back from Syria, French Interior minister announced. (Photo by Vincent Kessler/Reuters)

Mario Huettenhofer, chief of the German company 3D Fab, presents his own face as 3d print during the international fairs FabCon 3.D and Rapid.Tech in Erfurt, Germany, Thursday, May 15, 2014. 130 exhibitors from all over the world present the entire world of 3D printing. The trade fairs are accompanied by specialist programs featuring 80 scientists, practitioners and trend analysts from ten countries, who will explain the latest findings, trends and applications for additive processes in industry and for 3D printing in the private sector to newcomers, experts and consumers alike. (Photo by Jens Meyer/AP Photo)

Rescuers carry a man wounded by a mine that went off in the Bustan al-Diwan neighborhood of Homs, Syria, Saturday, May 10, 2014. Thousands of Syrians streamed into war-battered parts of the central city of Homs for the first time in nearly two years Saturday, many making plans to move back just days after rebels surrendered their strongholds to pro-government forces. The surrender deal is widely seen as a victory for Assad weeks ahead of a presidential election on June 3 that he is expected to win, giving him a mandate to continue his violent crackdown on rebels in the Syrian civil war, which activists say has killed more than 150,000 people. (Photo by AP Photo)

Filipino soldiers fire their weapons at a mock target during a live-fire exercise with their US counterpart at the ongoing joint U.S.-Philippines military exercise dubbed Balikatan 2014, Saturday, May 10, 2014 at the Philippine Army training camp at Fort Magsaysay, Nueva Ecija province in northern Philippines. More than 5,000 U.S. and Filipino troops have begun two weeks of military exercises to flex their muscle in jointly dealing with potential crisis in the Philippines, which is prone to natural disasters and has been locked in a dangerous standoff with China over a disputed shoal. This year's war games focuses on maritime security and humanitarian assistance especially in dealing with disasters. (Photo by Bullit Marquez/AP Photo)

An Iraqi policeman stands near burning vehicles moments after one in a series of bombs hit the Shiite stronghold of Sadr City, in Baghdad, Iraq, Tuesday, May 13, 2014. A wave of car bombings in mainly Shiite areas of Baghdad killed tens on Tuesday, officials said. (Photo by Karim Kadim/AP Photo)

A freshman midshipman, known as a plebe, crawls through a muddy trench underneath barbed wire during Sea Trials, a day of physical and mental challenges that caps off the freshman year at the U.S. Naval Academy, in Annapolis, Md., Tuesday, May 13, 2014. (Photo by Patrick Semansky/AP Photo)

People attack the Soma offices of Prime Minister Recep Tayyip Erdogan's Justice and Development Party during his visit to the coal mine in Soma, Turkey, Wednesday, May 14, 2014. A violent protest erupted Wednesday in the Turkish city of Soma, where at least 238 coal miners have died after a mine explosion. Many in the crowd expressed anger at Prime Minister Recep Tayyip Erdogan's government. Rocks were being thrown and some people were shouting that Erdogan was a “Murderer!” and a “Thief!” (Photo by Emrah Gurel/AP Photo)

A woman looks at a sculpture entitled “Noeud rose miroir” by French artist Jean-Michel Othoniel are on display in the solo exhibition “Monumental Sculptures” at the Galerie Perrotin in Hong Kong, China, 13 May 2014. The exhibit runs until 21 June. (Photo by Alex Hofford/EPA)

Pakistani suspects of a gang rape, center, leave a court after outraged citizens pelted the suspects with ink and tomatoes, in Mansehra, Pakistan, Wednesday, May 14, 2014. Pakistani police have arrested a seminary teacher and two of his friends on charges of gang raping a college girl in a city in the northwest, a police official said Wednesday. The case is unusual since rape cases are rarely prosecuted in Pakistan and women who complain are often stigmatized. (Photo by Aqeel Ahmad/AP Photo)

A general view of the atmosphere during the 67th Annual Cannes Film Festival on May 15, 2014 in Cannes, France. (Photo by Dave J. Hogan/Getty Images)

A federal police looks for the assigned weapon that corresponds to the rural police's identification card before the start of a ceremony in Tepalcatepec, Mexico, Saturday, May 10, 2014. At the ceremony in the town where the vigilante movement began in February 2013, officials handed out new pistols, rifles and uniforms to 120 self-defense group members who were sworn into a new official rural police force. Mexico's government on Saturday began demobilizing the vigilante movement of assault-rifle-wielding ranchers and farmers that had succeeded in largely expelling the Knights Templar cartel from the western state of Michoacan when authorities couldn't. (Photo by Eduardo Verdugo/AP Photo)

Austrian singer Conchita Wurst attends a press conference in Vienna, Austria Sunday May 11, 2014. Bearded drag queen Conchita Wurst has made a triumphant return to Austria after winning the Eurovision Song Contest in Copenhagen Saturday, in what the country's president called a victory for tolerance in Europe. (Photo by Ronald Zak/AP Photo)

People hold a rally to mark and celebrate the announcement of the results of the referendum on the status of Luhansk region in Luhansk May 12, 2014. Pro-Moscow rebel leaders in eastern Ukraine called on Monday for their region to become part of Russia after declaring victory in a weekend referendum on self-rule. (Photo by Valentyn Ogirenko/Reuters)

WSSC allows visitors to its water main project that links Montgomery to Prince Georges on May, 14, 2014 in Kensington, MD. Pictured, a view down the pipe. The bike in the foreground is used by inspectors to traverse the more than 5 miles of pipe. (Photo by Bill O'Leary/The Washington Post)

WSSC allows visitors to its water main project that links Montgomery to Prince Georges on May, 14, 2014 in Kensington, MD. Pictured, a view looking straight up from the bottom of the hole. (Photo by Bill O'Leary/The Washington Post)

A slum dweller cries after her house was demolished by local authorities at a slum area in the northern Indian city of Chandigarh May 10, 2014. Authorities claimed that the houses in the area were illegally built. (Photo by Ajay Verma/Reuters)

Anti-narcotics police agents incinerate seized packages of cocaine, in Trinidad, Bolivia, Wednesday, May 14, 2014. Anti-drug police burned over 1500 kilograms of drugs seized during last week's operations on the eastern region Beni, according to Police Colonel Mario Centellas, director of Bolivia's special forces against drug trafficking. (Photo by Juan Karita/AP Photo)

X-Men fans attempt to set the Guiness World Record for the largest gathering of people dressed as X-Men characters on May 12, 2014 in Leicester Square, London, England. (Photo by Ben A. Pruchnie/Getty Images)

Hundreds of demonstrators protest against money spent on the World Cup preparations in Sao Paulo, Brazil, Thursday, May 15, 2014. Protesters and police clashed Thursday, as demonstrations against the World Cup and rallies calling for improved public services erupted in several Brazilian cities. (Photo by Andre Penner/AP Photo)

Soldiers take part in a ceremony presenting the troops who will provide security during the World Cup at Brigadier Sampaio Camp in Rio de Janeiro, Brazil, Monday, May 12, 2014. Rio de Janeiro is one of the host cities for the 2014 World Cup soccer tournament that starts on June 12. (Photo by Silvia Izquierdo/AP Photo)