An Iraqi soldier carries a displaced woman to help her cross the bridge at the outskirts of Baghdad May 19, 2015. Iraqi security forces on Tuesday deployed tanks and artillery around Ramadi to confront Islamic State fighters who have captured the city in a major defeat for the Baghdad government and its Western backers. (Photo by Reuters/Stringer)

A nail house sits atop a mound, next to a construction site for a new residential area, in Yibin, Sichuan province, China, May 19, 2015. According to local media, owners of the nail house refused to move as they couldn't reach an compensation agreement with the authority in charge of the demolition. The house is now sitting on a mound about 20 metres above ground as the land around the house were dug out by the developer. (Photo by Reuters/Stringer)

A nail house (centre L) sits atop a mound, next to a construction site for a new residential area, in Yibin, Sichuan province, China, May 19, 2015. (Photo by Reuters/Stringer)

A Cambodian student of Royal University of Fine Arts performs during a reenactment of torture and execution committed by the Khmer Rouge during their reign of terror in the 1970s to mark the annual Day of Anger at Choeung Ek, a former Khmer Rouge “killing field”, on the outskirt of Phnom Penh, Cambodia Wednesday, May 20, 2015. Cambodia on Wednesday marked the 36th anniversary of the Day of Anger to remember the atrocities committed during the Khmer Rouge's 1975-79 era. (Photo by Heng Sinith/AP Photo)

Cambodians perform a play based on the Khmer Rouge regime during the annual “Day of Anger” ceremony at the Choeung Ek “Killing Fields” site, located on the outskirts of Phnom Penh, May 20, 2015. Thousands of Cambodians, including monks, gathered at the site to remember those who perished during the radical communist Khmer Rouge's 1975-79 regime. (Photo by Samrang Pring/Reuters)

A scene from the notorious “Killing Fields” is re-enacted during a ceremony at the Choeung Ek Genocidal Center in Phnom Penh, Cambodia, 20 May 2015. Cambodia marks the annual Anger Day on 20 May to commemorate the victims who died during the cruel rule of the Khmer Rouge regime from 1975-1979. Some two million Cambodians are estimated to have died by starvation and forced labour or were killed in politically justified executions during the Khmer Rouge regime. (Photo by Mak Remissa/EPA)

Rescue workers search amongst the rubble of a collapsed nine-storey residential building in Guiyang, Guizhou province, China, May 20, 2015. According to Xinhua News Agency, at the time of the collapse, there were people inside the building and that the number of casualties are unknown. (Photo by Reuters/China Daily)

The Indonesian navy scuttles foreign fishing vessels caught fishing illegally in Indonesian waters near Bitung, North Sulawesi May 20, 2015 in the is photo taken by Antara Foto. A total of 19 foreign boats from Vietnam, Thailand, Philippines and one from China were destroyed near Bitung as part of an ongoing crackdown by the Indonesian government on illegal fishing. (Photo by Fiqman Sunandar/Reuters/Antara Foto)

A man uses a mobile phone while riding a camel through a traffic jam in downtown Cairo, Egypt May 20, 2015. (Photo by Mohamed Abd El Ghany/Reuters)

A woman holding her children dances as protesters pass by during a protest against Burundi President Pierre Nkurunziza and his bid for a third term in Bujumbura, Burundi May 19, 2015. (Photo by Goran Tomasevic/Reuters)

Protestors opposed to the Burundian president Pierre Nkurunziza's third term in office gather by a burning barricade during a demonstration in the Cibitoke neighborhood of Bujumbura on May 19, 2015. Thousands of demonstrators opposed to Burundian President Pierre Nkurunziza defied warning shots and took to the streets of Bujumbura, as their leaders called for them to overcome their fears and continue the fight. (Photo by Carl De Souza/AFP Photo)

A South Korean army's K-9 tank takes part in a military drill at a training field in Yeoncheon, near the demilitarized zone which separates the two Koreas, in South Korea, May 20, 2015. On Wednesday, North Korea warned the United States not to challenge its sovereign right to boost military deterrence and boasted of its ability to miniaturize nuclear warheads, a claim it has made before and which has been widely questioned by experts and never verified. (Photo by Lim Byung-sik/Reuters/Yonhap)

Yemenis, who were stranded in Egypt, pray as they disembark from their plane after returning home, at Sanaa international aiport May 20, 2015. Some 200 Yemenis who have been stuck in Egypt and unable to return home arrived in the capital Sanaa on Wednesday in the first such flight from Egypt, though many more are expected in the coming days and weeks, officials say. (Photo by Khaled Abdullah/Reuters)

Norway's Air Force F-16 fighters patrol over the Baltics during a NATO air policing mission from Zokniai air base near Siauliai, Lithuania, May 20, 2015. (Photo by Ints Kalnins/Reuters)

Birds fly in front of an oil-drilling platform over an oil slick along the coast of Refugio State Beach in Goleta, California, United States, May 20, 2015. A pipeline ruptured along the scenic California coastline on Tuesday, spilling some 21,000 gallons (79,000 liters) of oil into the ocean and on beaches before it could be secured, a U.S. Coast Guard spokeswoman said. (Photo by Lucy Nicholson/Reuters)

Volunteer William McConnaughey, 56, who drove from San Diego to help shovel oil off the beach, stretches out his hands after carrying buckets of oil from an oil slick along the coast of Refugio State Beach in Goleta, California, United States, May 20, 2015. A pipeline ruptured along the scenic California coastline on Tuesday, spilling some 21,000 gallons (79,000 liters) of oil into the ocean and on beaches before it could be secured, a U.S. Coast Guard spokeswoman said. (Photo by Lucy Nicholson/Reuters)

Graduate Robert McConnel asks U.S. President Barack Obama to strike a “James Bond” pose during the 134th Commencement Exercises of the United States Coast Guard Academy in New London, Connecticut May 20, 2015. (Photo by Kevin Lamarque/Reuters)

Pilgrims sing and dance on their way to the shrine of El Rocio in Donana National Park, southern Spain May 20, 2015. Every spring hundreds of thousands of devotees converge at a shrine to pay homage to the Virgin del Rocio during an annual pilgrimage which combines religious fervour and festive colour. (Photo by Marcelo del Pozo/Reuters)

Pilgrim, Maria Raposo, 18, poses for a portrait on her way to the shrine of El Rocio in Donana National Park, southern Spain May 20, 2015. (Photo by Marcelo del Pozo/Reuters)

Haitian immigrants carry their luggage as they arrive at the Nossa Senhora da Paz Catholic Church, in the Glicerio neighborhood of Sao Paulo, Brazil May 20, 2015. Three years ago, the Brazil government announced the creation of a humanitarian visa that would be exclusively issued to Haitian refugees after the devastating 2010 earthquake on the island. Around 300 Haitians immigrants have arrived in the last week in Sao Paulo looking for work from the northern state of Acre, local media reported. (Photo by Nacho Doce/Reuters)

Media stand on the SkyPortal, a 14-foot wide disc that delivers high-definition live video footage from the street below, in the One World Observatory observation deck on the 100th floor of the One World Trade center tower in New York during a media tour of the site May 20, 2015. One World Observatory will open to the public on May 29. (Photo by Mike Segar/Reuters)

A news photographer looks out the window at the Manhattan skyline from the One World Observatory observation deck on the 100th floor of the One World Trade center tower in New York during a press tour of the site May 20, 2015. (Photo by Mike Segar/Reuters)

Part of a time-lapse projection of the New York skyline through the years is seen inside the Sky Pod Elevator on the way up to the One World Observatory observation deck on the 100th floor of the One World Trade center tower in New York, during a media tour of the site May 20, 2015. (Photo by Mike Segar/Reuters)

A dancer performs outside the National Theather in honour of late archbishop of San Salvador Oscar Arnulfo Romero during a festival to commemorate the 35th anniversary of his assassination in San Salvador, El Salvador March 24, 2015. Salvadorans are preparing for the beatification of Archbishop Romero on May 23, who was murdered by a right-wing death squad in 1980. The Vatican has said it hopes the event will help with reconcilation efforts in the violence-plagued country. (Photo by Jose Cabezas/Reuters)

An Aymara woman holds a bag of bread in La Paz, May 20, 2015. Bolivian bakers went on a 48-hour strike on Monday after the government decided to scrap subsidies, arguing the price of flour is already low. (Photo by David Mercado/Reuters)

Emergency medical personnel wear Level 2 hazmat suits as they go over their procedures while training for a mass-casualty hazardous materials disaster in San Diego, California, May 20, 2015. (Photo by Mike Blake/Reuters)

British Hurricane (top) and Spitfire planes from World War II perform a fly-past as over Ramsgate harbour in south east England, May 21 , 2015. Over fifty “Little Ships”, used in action in 1940, sailed to Dunkirk in northern France to mark the seventy fifth anniversary of Operation Dynamo in World War II when a mass evacuation took place of Allied troops as German forces advanced through France. (Photo by Toby Melville/Reuters)

An Indonesian paramedic gives medical treatment to a Rohingya migrant woman, who recently arrived in Indonesia by boat, inside a temporary compound for refugees in Aceh Timur regency, Indonesia's Aceh Province May 21, 2015. Malaysia and Indonesia issued a joint statement on Wednesday saying they will continue to offer international assistance to 7,000 migrants adrift at sea and assist them with “resettlement and repatriation” within a year with international help. (Photo by Reuters/Beawiharta)

Pilgrims pray in Quema river on their way to the shrine of El Rocio in Aznalcazar, southern Spain May 21, 2015. Every spring hundreds of thousands of devotees converge at a shrine to pay homage to the Virgin del Rocio during an annual pilgrimage which combines religious fervour and festive colour. (Photo by Marcelo del Pozo/Reuters)

Pilgrims push a carriage as they cross Quema river on their way to the shrine of El Rocio in Aznalcazar, southern Spain May 21, 2015. (Photo by Marcelo del Pozo/Reuters)

Pilgrims pose for a picture taken for a friend near the shrine of El Rocio in Almonte, southern Spain May 22, 2015. Every spring hundreds of thousands of devotees converge at the shrine to pay homage to the Virgin del Rocio during an annual pilgrimage which combines religious fervour and festive colour. (Photo by Marcelo del Pozo/Reuters)

A robot is seen assembling Audi A8 models at their plant in Neckarsulm near Heilbronn May 21, 2015. Audi will hold their annual shareholders meeting on May 22, 2015. (Photo by Michael Dalder/Reuters)

A worker assembles Audi A8 models at their plant in Neckarsulm near Heilbronn May 21, 2015. (Photo by Michael Dalder/Reuters)

Actress Alysia Reiner attends the Red Nose Charity event in New York May 21, 2015. (Photo by Eduardo Munoz/Reuters)

Actress Alysia Reiner attends the Red Nose Charity event in New York May 21, 2015. (Photo by Eduardo Munoz/Reuters)

Actor Kellan Lutz attends the Red Nose Charity event in New York May 21, 2015. (Photo by Eduardo Munoz/Reuters)

A member of the Snuff Puppets, a puppet theatre group from Melbourne Australia, chases to “lick” commuters at a train station in Singapore May 22, 2015. The group was performing in Singapore as part of 50 Bridges, a series of vibrant arts and engagement programs celebrating the fiftieth anniversary of diplomatic relations between Australia and Singapore. (Photo by Edgar Su/Reuters)

A member of the Snuff Puppets, a puppet theatre group from Melbourne Australia, chases to “lick” commuters at a train station in Singapore May 22, 2015. (Photo by Edgar Su/Reuters)

Armed Kurdish female fighters from People's Protection Units (YPG) talk to each other in the Assyrian village of Tel Nasri, western of Tel Tamr town, after the YPG said they retook control of the area from the Islamic State, May 21, 2015. (Photo by Rodi Said/Reuters)

Passengers hang on the doors of a train as it passes the Olympic rings placed at the Madureira Park ahead the Rio 2016 Olympic Games, in Rio de Janeiro May 22, 2015. The rings, the official symbol of the Olympic Games, was donated to Rio by Britain after they decorated the Tyne Bridge in Newcastle during the 2012 London Olympic Games. (Photo by Ricardo Moraes/Reuters)

British artist Grayson Perry poses in front of his tapestry, “Comfort Blanket” at the launch of his show “Provincial Punk” at the Turnery Contemporary in Margate in south east England, May 22 , 2015. Over fifty of Perry's artworks, consisting of ceramics, paintings, sketch books and large tapestries are on show until September 13. (Photo by Toby Melville/Reuters)

Kashmiri Muslim women offer prayers during Friday following celebrations for “Meeraj-un-Nabi” at the Hazratbal shrine in Srinagar May 22, 2015. Thousands of Kashmiri Muslims on Friday thronged the Hazratbal shrine, which houses what is believed to be a relic from the beard of Prophet Mohammed, to celebrate concluding ceremonies of Meeraj-un-Nabi or ascension of Prophet Mohammed to Heaven. (Photo by Danish Ismail/Reuters)

Visitors observe a 3D model of a female body as they visit the “Gallery of Humankind. Our evolution, our body” exhibition at the Museum of Natural Sciences in Brussels, Belgium, May 22, 2015. (Photo by Francois Lenoir/Reuters)

Students watch a presentation as they sit in cocoons representing a uterus during a visit to the “Gallery of Humankind. Our evolution, our body” exhibition at the Museum of Natural Sciences in Brussels, Belgium, May 22, 2015. (Photo by Francois Lenoir/Reuters)

A young visitor observes a 3D model of an australopythecus afarensis during a visit to the “Gallery of Humankind. Our evolution, our body” exhibition at the Museum of Natural Sciences in Brussels, Belgium, May 22, 2015. (Photo by Francois Lenoir/Reuters)

A protester fights with a policeman during a protest in central Bangkok May 22, 2015. Thai authorities detained dozens of student activists protesting against military rule on Friday, a year after the army seized power from an elected government. The military has quashed public demonstrations and any sign of resistance to the May 22, 2014, coup which it says it was forced to undertake to end violence between rival factions. (Photo by Damir Sagolj/Reuters)

Protesters are detained by policemen during a protest in central Bangkok May 22, 2015. (Photo by Damir Sagolj/Reuters)

Revellers attend the Victorian Picnic during the Wave and Goth festival in Leipzig, Germany, May 22, 2015. The annual festival, known in Germany as Wave-Gotik Treffen (WGT), features over 100 bands and artists in venues all over the city playing Gothic rock and other styles of the dark wave music subculture. One of the biggest of its kind, the event attracts a regular audience of up to 20,000, the organisers said. (Photo by Hannibal Hanschke/Reuters)

Revellers attend the Victorian Picnic during the Wave and Goth festival in Leipzig, Germany, May 22, 2015. (Photo by Hannibal Hanschke/Reuters)

The first mock-up of the iconic Darth Vader helmet is seen during the “Star Wars Identities” Exhibtion Press Preview & VIP Opening at Odysseum on May 20, 2015 in Cologne, Germany. (Photo by Sascha Steinbach/Getty Images)

An American policeman supervises training at a National Academy of Internal Affairs in Kiev, Ukraine, Saturday, May 16, 2015. U.S. Assistant Secretary of State Victoria Nuland is in Ukraine this week to hold talks with the country's top officials and oversee their efforts at transforming the Ukrainian police into a modern police force. (Photo by Sergei Chuzavkov/AP Photo)

A man uses his mobile phone to photograph a circular sun halo in Mexico City, Thursday, May 21, 2015. The ring around the sun is a fairly common weather phenomenon caused by ice crystals in the upper atmosphere. (Photo by Marco Ugarte/AP Photo)

Grace White, left, and her sister Sophia White react after getting splashed by Hope, who seems to nbe laughing, at the Clearwater Marine Aquarium Monday, may 18, 2015. Grace White, 7 years old from Fayetteville, NC suffers from DIPG, a form of pediatric brain cancer. She celebrated her 7th birthday on May 17 and visited the Clearwater Marine Aquarium (CMA) Monday, May 18, along with her mom Amy, 38, dad Scott, 39, brother Jackson, 10, sisters Sophia, 8, and Charlotte, 23 months old. (Photo by Jim Damaske/The Tampa Bay Times via AP Photo)