A student at the University of Nairobi looks down from the window at the Kimberly ladies hostels at the Kikuyu campus near the capital Nairobi, April 12, 2015. A Kenyan student died and more than 100 others were injured as they fled after a electricity transformer explosion before dawn on Sunday triggered fears that their campus was being attacked, officials said. Students jumped from windows at their University of Nairobi residence halls in a stampede that underlined growing tensions just over a week after gunmen stormed another university campus. (Photo by Thomas Mukoya/Reuters)

Civil defence members carry a dead child after what activists said was shelling by warplanes loyal to Syria's president Bashar Al-Assad in Aleppo's rebel-controlled Bab Al-Nairab district April 12, 2015. (Photo by Abdalrhman Ismail/Reuters)

Korean People's Army personnel take part in a ceremony marking the birth anniversary of late leader Kim Il Sung at the Kumsusan Palace of the Sun in Pyongyang April 12, 2015 in this photo released by North Korea's Korean Central News Agency (KCNA) April 13, 2015. (Photo by Reuters/KCNA)

Onlookers watch from a harbour wall as the largest container ship in world, CSCL Globe, docks during its maiden voyage, at the port of Felixstowe in south east England, in this January 7, 2015 file photo. China is expected to releas exports, imports and trade surplus for March this week. (Photo by Toby Melville/Reuters)

A poster advertising SunSilk shampoo is seen in Tacloban, Philippines city in this October 15, 2014 file photo. Unilever is expected to release Q1 results this week. (Photo by Thin Lei Win/Reuters)

A worker drags a cart of cardboard to be recycled, on the street in Jakarta, April 13, 2015. (Photo by Reuters/Beawiharta)

Revelers dance on a street during the Jamaica Carnival Road march in Kingston April 12, 2015. The march is on the final day of festivities of the Carnival season. (Photo by Gilbert Bellamy/Reuters)

A reveler takes part during the Jamaica Carnival Road march in Kingston April 12, 2015. (Photo by Gilbert Bellamy/Reuters)

A reveler takes part during the Jamaica Carnival Road march in Kingston April 12, 2015. (Photo by Gilbert Bellamy/Reuters)

Revelers take part during the Jamaica Carnival Road march in Kingston April 12, 2015. (Photo by Gilbert Bellamy/Reuters)

A couple lies on the grass before Kaskade plays at the Coachella Valley Music and Arts Festival in Indio, California April 12, 2015. (Photo by Lucy Nicholson/Reuters)

Victoria's Secret model Alessandra Ambrosio of Brazil (C) poses for a photo with friends at the Coachella Valley Music and Arts Festival in Indio, California April 12, 2015. (Photo by Lucy Nicholson/Reuters)

A woman does acrobatics as she waits for a band to start playing at the Coachella Valley Music and Arts Festival in Indio, California April 12, 2015. (Photo by Lucy Nicholson/Reuters)

People pose in front of a butterfly artwork at the Coachella Valley Music and Arts Festival in Indio, California April 12, 2015. (Photo by Lucy Nicholson/Reuters)

Fans listen to David Guetta at the Coachella Valley Music and Arts Festival in Indio, California April 12, 2015. (Photo by Lucy Nicholson/Reuters)

Victoria's Secret model Alessandra Ambrosio of Brazil (C) walks through the Coachella Valley Music and Arts Festival with friends, in Indio, California April 12, 2015. (Photo by Lucy Nicholson/Reuters)

A woman does a handstand as she waits for a band to start playing at the Coachella Valley Music and Arts Festival in Indio, California April 12, 2015. (Photo by Lucy Nicholson/Reuters)

Concert attendees walk past a giant butterfly sculpture on the main grounds on day three of the Coachella Music Festival in Indio, California on April 12, 2015. (Photo by Robyn Beck/AFP Photo)

Tyler the Creator performs on the second day of the Coachella Music Festival in Indio, California, on April 11, 2015. (Photo by Robyn Beck/AFP Photo)

U.S. rapper Kanye West (3rd R in the water, facing the camera), husband of U.S. television personality Kim Kardashian, walks out of a lake, together with security guards, policemen and fans, during a concert in Yerevan, early April 13, 2015. West tried to walk on water in Armenia in the early hours of Monday morning after jumping into a lake. Towards the end of a free concert he was performing in Yerevan, West decided to dive into the city's Swan Lake and dozens of his fans followed suit. (Photo by Vahan Stepanyan/Reuters/PAN Photo)

Cricket, West Indies vs England, First Test; Sir Vivian Richards Stadium, Antigua, April 13, 2015: Entertainment on the edge of the field. (Photo by Jason O'Brien/Reuters)

Cricket, West Indies vs England, First Test; Sir Vivian Richards Stadium, Antigua, April 13, 2015: England's Joe Root and Ian Bell look on as girls dance in the background. (Photo by Jason O'Brien/Reuters)

Dead fish are pictured next to a rowing athlete as he puts his boat on the water before a training session at the Rodrigo de Freitas lagoon, in Rio de Janeiro April 13, 2015. About 500kg of fish have been removed from the lagoon since last week after sea cold water got into the lagoon, authorities said, according to local media. Rodrigo de Freitas lagoon will host the rowing and canoe sprint competitions in the 2016 Olympic Games. (Photo by Ricardo Moraes/Reuters)

Militia members stand at attention during a ceremony in Caracas April 13, 2015. Supporters of late Venezuelan President Hugo Chavez commemorated 13 years of his return to power after a brief coup that ousted him for two days in 2002. April 13 is now celebrated in the country as the day of the militia. (Photo by Marco Bello/Reuters)

People wearing costumes attend the annual water-splashing festival to mark the New Year of the Dai minority in Jinghong, Yunnan province, April 13, 2015. (Photo by Reuters/China Daily)

A group of tourists holds their beer while relaxing at Kuta beach on Bali resort island April 14, 2015. Two Islamic parties have proposed legislation that would ban all consumption of alcoholic drinks and bring jail terms of up to two years for offenders in Indonesia, home to the world's largest Muslim population. The proposed legislation banning all alcohol consumption would exempt some locations to protect tourism such as five-star hotels and the resort island of Bali. (Photo by Zul Edoardo/Reuters)

A worker of PT Multi Bintang Indonesia Tbk. holds up a cutout of a Bintang beer at a beer factory in Jakarta April 17, 2015. Two Islamic parties have proposed legislation to ban all consumption of alcoholic drinks and hand jail terms of up to two years to offenders in Indonesia, home to the world's largest Muslim population. (Photo by Reuters/Beawiharta)

People play a traditional game during Cambodia's New Year in central Phnom Penh April 14, 2015. Cambodians celebrate the New Year from April 14 to 16. (Photo by Samrang Pring/Reuters)

Women hold eggs on spoons in their mouth as they take part in a traditional game during Cambodia's New Year in central Phnom Penh April 14, 2015. (Photo by Samrang Pring/Reuters)

A man holds an egg on a spoon in his mouth as he takes part in a traditional game during Cambodia's New Year in central Phnom Penh April 14, 2015. (Photo by Samrang Pring/Reuters)

A man hits a claypot as he takes part in a traditional game during Cambodia's New Year in central Phnom Penh April 14, 2015. (Photo by Samrang Pring/Reuters)

A Brazilian Indian from the Kaingang ethnic group attends the Terra Livre Camp (Free Land Camp) during a National Indigenous Mobilization at the Esplanade of Ministries in Brasilia April 14, 2015. Organizers of the mobilization aim to discuss issues of land demarcation and indigenous rights with authorities. (Photo by Ueslei Marcelino/Reuters)

Brazilian Indians from various indigenous ethnic groups take part in a protest during a National Indigenous Mobilization in front of Planalto Palace in Brasilia April 15, 2015. Organizers of the mobilization aim to discuss issues of land demarcation and indigenous rights with authorities. (Photo by Ueslei Marcelino/Reuters)

Brazilian Indian women are seen sucking ice cream in protest during a National Indigenous Mobilization in front of Planalto Palace in Brasilia April 15, 2015. (Photo by Ueslei Marcelino/Reuters)

A Brazilian native checks his tablet computer during a session to honor native people at the National Congress in Brasilia, during the National Mobilization Week on April 16, 2015. Several Brazilian tribes are taking part in the so-called Free Land camp. (Photo by Evaristo Sa/AFP Photo)

A woman holds the hand of a girl as they rush away from a site hit by what activists said was an airstrike by forces loyal to Syria's President Bashar al-Assad in Aleppo's al-Fardous district April 14, 2015. (Photo by Rami Zayat/Reuters)

Syrian emergency services personnel try to pull a woman out from under the rubble of a building following a reported barrel bomb attack by government forces on the rebel held Bustan al-Qasr district in the east of the northern Syrian city of Aleppo on April 13, 2015. (Photo by Zein Al-Rifai/AFP Photo)

Ultra-orthodox Jews visit Yad Vashem's Holocaust History Museum in Jerusalem April 14, 2015. Beginning Wednesday night, Israel marks its annual memorial day commemorating the six million Jews killed by the Nazis during World War Two. (Photo by Baz Ratner/Reuters)

A gold miner scoops mud while digging an open pit at the Chudja mine in the Kilomoto concession near the village of Kobu in this February 23, 2009 file photo. European importers of minerals from conflict zones should be forced to certify their goods “blood-free”, an influential group of EU lawmakers said on April 14, 2015, seeking to toughen a proposal to prevent the financing of warlords in Africa. Much of the gold, tantalum, tin and tungsten used in electronics and lighting is mined in areas of civil conflict in Africa and the European Commission, the EU executive, last year presented a plan for a voluntary certification scheme. (Photo by Finbarr O'Reilly/Reuters)

A trader shows a piece of gold at his shop in the town of Al-Fahir in North Darfur in this September 24, 2013 file photo. (Photo by Mohamed Nureldin Abdallah/Reuters)

An artisanal miner washes tin ore before it is bagged up and weighed, ready to be transported to the nearest major town for export in the Kalimbi tin mine in this October 31, 2012 file photo. (Photo by Jonny Hogg/Reuters)

South African women protest as rioting and looting is quelled during anti-foreigner violence in Durban, April 14, 2015. The wave of anti-foreigner violence that has killed four people in and around the South African city of Durban in recent days, spread to the town center on Tuesday, local media reported, with police firing rubber bullets to disperse angry crowds. (Photo by Rogan Ward/Reuters)

A student wearing facepaint walks past wooden crosses in memory of the Garissa university students who were killed by gunmen, at a memorial concert at the “Freedom Corner” in Kenya's capital Nairobi April 14, 2015. Kenya gave the United Nations three months to remove Dadaab camp, housing 350,000 registered Somali refugees, as part of its response to the killing of 148 people in nearby Garissa by a Somali Islamist group. (Photo by Noor Khamis/Reuters)

Isaiah Lewis, 7, from left, Ianna Johnson, 13, and Katelyn Robinson, 14, visit a makeshift memorial where Walter Scott was fatally shot by a white police officer after he fled a traffic stop, Sunday, April 12, 2015, in North Charleston, S.C. The officer, Michael Thomas Slager, has been fired and charged with murder. (Photo by David Goldman/AP Photo)

Republicans shout slogans during a demonstration to mark the 84th anniversary of Spain's Second Republic in Malaga, southern Spain, April 14, 2015. Spain celebrates today the 84th anniversary of the proclamation of the second Spanish Republic, which was overthrown by dictator Francisco Franco in a three-year civil war that claimed half a million lives. (Photo by Jon Nazca/Reuters)

Photographers take pictures of the unmanned SpaceX Falcon 9 rocket with Dragon lifts off from launch pad 40 at the Cape Canaveral Air Force Station in Cape Canaveral, Florida April 14, 2015. (Photo by Scott Audette/Reuters)