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A Tiger butterfly sits on the nose of a child during a photocall in the Natural History Museum's 'Sensational Butterflies' outdoor butterfly house in London on March 31, 2015.  AFP PHOTO / BEN STANSALL/AFP/Getty Images

A Hooded penitent from"La Veracruz" brotherhood takes part in front of an archangel "San Rafael custodio" during a Holy Week procession in Cordoba, Spain, Monday, March 30, 2015.  Hundreds of processions take place throughout Spain during the Easter Holy Week. ( AP Photo/Manu Fernandez)

A student works in a dark room on March 31, 2015, in Diyarbakir.  A massive power cut caused chaos Tuesday in large parts of Turkey, shutting down the metro systems in Istanbul and the capital Ankara, reports and official sources said.  AFP PHOTO/ILYAS AKENGIN/AFP/Getty Images

This photo taken on March 29, 2015 shows the top of a tower looming out of heavy fog in Qingdao, east China's Shandong province.  Falls in Chinese housing prices decelerated in March from the previous month, a survey showed on March 31, after authorities loosened mortgage and tax policies as growth in the world's second-largest economy slows.  CHINA OUT AFP PHOTOSTR/AFP/Getty Images

Kurdish fighters rest in a house on the outskirts of the Syrian town of Kobane, also known as Ain al-Arab, on March 30, 2015.  Islamic State (IS) fighters were driven out of Kobane on January 26, by Kurdish and allied forces.  AFP PHOTO/YASIN AKGUL/AFP/Getty Images

View of smoke billowing from the Villarrica volcano, in Pucon, some 800 km south of Santiago, on March 29, 2015.  Part of southern Chile is on orange alert because of an increase in activity at the Villarrica volcano, just weeks after it erupted and forced thousands of people to evacuate.  AFP PHOTO/ SEBASTIAN ESCOBARSEBASTIAN ESCOBAR/AFP/Getty Images

Ye Thura (top R, red) of the Ministry of Defence team kicks the ball as Kyi Linn Phyo blocks the strike of the 16/1 (A) team during the 4TV Cup match at the Myanmar Sepak Takraw Federation's court in Yangon on March 30, 2015.  The Ministry of Defence team won the match.  AFP PHOTO / SOE THAN WINSoe Than WIN/AFP/Getty Images

South Korean Marine amphibious assault vehicles fire smoke shells to land on the seashore during a joint landing operation by US and South Korean Marines in the southeastern port of Pohang on March 30, 2015.  The drill is part of the annual joint exercise Foal Eagle to enhance the combat readiness of the US and South Korea supporting forces in defense of the Korean Peninsula.  AFP PHOTO / JUNG YEON-JEJUNG YEON-JE/AFP/Getty Images

A fox runs past the door of 10 Downing Street in London on March 30, 2015.  British Prime Minister David Cameron will on March 30 ask Queen Elizabeth II to dissolve parliament, kicking off formal campaigning for one of the most unpredictable elections in decades.  AFP PHOTO / JUSTIN TALLISJUSTIN TALLIS/AFP/Getty Images

A Kashmiri villager walks near an injured horse close to a damaged house following landslides due to heavy rainfall in the village of Laden at Chadoora some 40kms west of Srinagar on March 30, 2015.  Landslides have buried at least 15 people in Indian Kashmir as hundreds fled their homes after heavy rain triggered flooding around the mountainous region.  Police and witnesses said landslides had buried at least four houses in Chadoora, the worst hit area of the Himalayan region where hundreds were killed in devastating floods last September.  AFP PHOTO/Tauseef MUSTAFATAUSEEF MUSTAFA/AFP/Getty Images

Kashmiri women wail and rush towards the body of a relative, victim of a landslide, as the same is recovered in the village of Laden some 45 Kilometers (28 miles) west of Srinagar, Indian-controlled Kashmir, Monday, March 30, 2015.  Hundreds of Kashmiris in both India and Pakistan moved to higher ground Monday as rain-swollen rivers swamped parts of the disputed Himalayan region placed under an emergency flood alert just six months after some 600 people died in flooding that left the region in shambles. ( AP Photo/Dar Yasin)

Kashmiri villagers gather during rescue efforts following landslides due to heavy rainfall in the village of Laden near Chadoora some 40km west of Srinagar on March 30, 2015.  Landslides have buried at least 15 people in Indian Kashmir as hundreds fled their homes after heavy rain triggered flooding around the mountainous region.  Police and witnesses said landslides had buried at least four houses in Chadoora, the worst hit area of the Himalayan region where hundreds were killed in devastating floods last September.  AFP PHOTO/Tauseef MUSTAFATAUSEEF MUSTAFA/AFP/Getty Images

A resident carries a sheep through waters in a neighbourhood of Srinagar on March 30, 2015.  At least 10 people have been buried by mudslides and hundreds more have had to flee their homes after heavy rain triggered flooding in Indian Kashmir, police said.  Mudslides buried at least four houses in Chadoora, the worst hit area of the Himalayan region where hundreds were killed in devastating floods last September.  AFP PHOTO/Rouf BHATROUF BHAT/AFP/Getty Images

Israeli border policemen detain a Palestinian protester during a protest marking Land Day in Jerusalem's Old City, Monday, March 30, 2015.  Land Day commemorates riots on March 30, 1976, when six people were killed during a protest by Israeli Arabs whose property was annexed in northern Israel to expand Jewish communities. ( AP Photo/Mahmoud Illean)

A runaway rhinoceros is watched by residents as it travels along a road in Hetauda, Makawanpur district some 40kms south-west of Kathmandu on March 30, 2015.  A runaway rhinoceros escaped from a wildlife reserve and ran through a town in central Nepal, terrifying commuters as its rampage left one dead and six injured, police said. A local police official told AFP the rhino escaped from the unfenced Parsa Wildlife Reserve and wandered some 20 kilometres into neighbouring Makwanpur district, shocking onlookers as it ran through the streets, chasing vehicles and people.  AFP PHOTO/BIDUR GIRIBIDUR GIRI/AFP/Getty Images

A young Nigerian girl walks past election posters, some showing presidential candidate, Muhammadu Buhari, in Kaduna, Nigeria Monday, March 30, 2015.  Nigerians are waiting in hope and fear for results of the tightest and most bitterly contested presidential election in the nation’s turbulent history. ( AP Photo/Jerome Delay)

People rally against the war in Yemen, in Islamabad, Pakistan, Monday, March 30, 2015.  Pakistan dispatched a plane Sunday to the Yemeni city of Hodeida, to try to evacuate some 500 citizens gathered there, according to Shujaat Azim, an adviser to Pakistan's prime minister.  Pakistan says some 3,000 of its citizens live in Yemen.  Placard on left reads "Pakistan should be a part of peace not war." ( AP Photo/B.K. Bangash)

An Iraqi soldier searches a for fighters of Islamic State group in Tikrit, 80 miles (130 kilometers) north of Baghdad, Iraq, Monday, March 30, 2015. ( AP Photo/Khalid Mohammed)

Serena Williams returns the ball to Svetlana Kuznetsova during their match at the Miami Open tennis tournament in Key Biscayne, Fla., Monday, March 30, 2015.  Williams won 6-2, 6-3. ( AP Photo/J Pat Carter)

Kurdish men gather around a bonfire in the Syrian town of Kobane, also known as Ain al-Arab, on March 28, 2015.  Islamic State (IS) fighters were driven out of Kobane on January 26 by Kurdish and allied forces.  YASIN AKGUL/AFP/Getty Images

Young boys play on a destroyed building near a sign reading "Kobane" in the Syrian town of Kobane, also known as Ain al-Arab, on March 28, 2015.  Islamic State (IS) fighters were driven out of Kobane on January 26 by Kurdish and allied forces.  YASIN AKGUL/AFP/Getty Images

The coffin leaves at the state funeral for the late Lee Kuan Yew, at the University Cultural Center, Sunday, March 29, 2015 in Singapore.  During a week of national mourning that began Monday after Lee's death at age 91, some 450,000 people queued for hours for a glimpse of Lee's coffin at Parliament House.  A million people visited tribute sites at community centers across the island and leaders and dignitaries from more than two dozen countries attended the state funeral. ( AP Photo/Joseph Nair)

A woman walks on a old sea bridge on Hengshaxiang island near Shanghai on March 29, 2015.  JOHANNES EISELE/AFP/Getty Images

Aymara women walk to a polling station during regional elections in Batallas, Bolivia, Sunday, March 29, 2015.  The political hegemony of Bolivia's ruling party is being put to the test Sunday as Bolivians head to the polls to vote in regional elections that will include electing governors, mayors and legislators. ( AP Photo/Juan Karita)

Hooded penitents from the La Paz brotherhood walk to the church to take part in a procession in Seville, Spain, Sunday, March 29, 2015.  Hundreds of processions take place throughout Spain during the Easter Holy Week. ( AP Photo/Emilio Morenatti)

An altar boy carries a cross after the morning Mass at the Cathedral of San Cristobal de La Laguna during a procession commemorating the arrival of Jesus in Jerusalem, on the Spanish Canary island of Tenerife on March 29, 2015.  Palm Sunday held annually on the Sunday before easter and commemorates the entry into Jerusalem of Jesus Christ.  DESIREE MARTIN/AFP/Getty Images

Roman Catholic clergymen carry palm fronds during the Palm Sunday procession at Church of the Holy Sepulchre, traditionally believed by many to be the site of the crucifixion and burial of Jesus Christ, in Jerusalem's Old City, Sunday, March 29, 2015.  Palm Sunday marks for Christians Jesus Christ's entrance into Jerusalem when his followers laid palm branches in his path, prior to his crucifixion. ( AP Photo/Oded Balilty)

A Nigerian man prays in the yard of the St Charles Catholic Church, scene of a 2014 bomb attack blamed on Boko Haram Islamic insurgents, in the mainly Christian Sabon Gari neighborhood of Kano, northern Nigeria on Palm Sunday, March 29, 2015.  Normally the church would be packed with up to four masses on Palm Sunday, but this year it held only one which was half-full, due to large numbers of Christians leaving before the elections, fearing violence and retribution after election results will be announced in the predominantly muslim town. ( AP Photo/Ben Curtis)

Girls hold palm leaves blessed during the morning Mass at the Cathedral of San Cristobal de La Laguna during a procession commemorating the arrival of Jesus in Jerusalem, on the Spanish Canary island of Tenerife on March 29, 2015.  Palm Sunday held annually on the Sunday before easter and commemorates the entry into Jerusalem of Jesus Christ.  DESIREE MARTIN/AFP/Getty Images

An elderly Nigerian woman arrives to validate her voting card using a fingerprint reader, prior to casting her vote later in the day, in the home town of opposition candidate Gen. Muhammadu Buhari, in Daura, Nigeria Saturday, March 28, 2015.  Nigerians went to the polls Saturday in presidential elections which analysts say will be the most tightly contested in the history of Africa's richest nation and its largest democracy. ( AP Photo/Ben Curtis)

Indian artists dressed as Hindu monkey god Hanuman (R) and Lakshman watch a video on their mobile phone during Rama Navami festival celebrations at a temple in Bangalore on March 28, 2015.  Rama Navami is a Hindu festival, celebrating the birth of the god Rama whom Hindus consider is the seventh incarnation of Lord Vishnu and is the oldest known Hindu god having human form.  Manjunath Kiran/AFP/Getty Images

Penitents of the Santisimo Cristo del Espiritu Santo brotherhood take part in a Holy Week procession in Zamora, Spain, Friday, March 27, 2015.  Hundreds of processions take place throughout Spain during the Easter Holy Week. ( AP Photo/Daniel Ochoa de Olza)

A member of the Iraqi security forces watches clashes, from over a blast wall, in the city of Tikrit on March 28, 2015 during a military operation to retake the northern Iraqi city from Islamic State group jihadists.  Retaking Tikrit, where jihadists have rigged streets and buildings with explosives, will require "major sacrifices" on the part of Iraqi forces, a senior intelligence officer said.  AHMAD AL-RUBAYE/AFP/Getty Images

An Indian devotee dressed as Hindu deity Shiva (C) holds a snake as he participates in a Hindu religious procession on the occasion of the Ram Navmi festival in Amritsar on March 28, 2015.  Ram Navmi commemorates the birth of Hindu deity Rama.  AFP PHOTO /NARINDER NANUNARINDER NANU/AFP/Getty Images

A young Hindu girl, her face decorated with vermilion powder, sits for a ceremony where she and other girls are worshipped as "Kumari," or living goddess, during Ram Navami festival, at a temple in Kolkata, India, Saturday, March 28, 2015.  Ram Navami marks the birth of Hindu God Rama. ( AP Photo/Bikas Das)

Hindu devotees bathe in a natural hot water spring, near the banks of the Sutlej River during the Hindu festival of Makar Sankranti , at Tattapani, about 52 kilometers (33 miles) from Shimla, India, Thursday, Jan. 14, 2010.  Hundreds of thousands of devout Hindus take ritualistic dips across the country on this auspicious day. ( AP Photo/Anil Dayal)

A woman holds back her tears as she waits to place a candle around a portrait of the late Lee Kuan Yew as a tribute to him, Friday, March 27, 2015, in Singapore.  Lee, 91, died Monday at Singapore General Hospital after more than a month of battling severe pneumonia.  The government declared a week of mourning for the leader who is credited with transforming the resource-poor island into a wealthy finance and trade hub with low crime and corruption in a region saddled with graft, instability and poverty. ( AP Photo/Wong Maye-E)

A man empties his home flooded by heavy rainfall, in Copiapo, Chile on March 26, 2015.  Flash floods in a normally bone-dry region of northern Chile have killed at least four people and left 22 missing, officials said Thursday, prompting the government to declare a state of emergency and send in the army.  PABLO SANHUEZA/AFP/Getty Images

New York firefighters battle a blaze at a commercial and residential block on March 26, 2015, in New York's East Village.  The entire building at 125 Second Avenue was engulfed in flames and the lower two floors appeared partially collapsed, television footage and press photographs showed.  Twelve people were reported hurt according to fire department officials.  KENA BETANCUR/AFP/Getty Images

Members of the Panamanian national police and of special forces are seen during a drill in Panama Pacific airport near Panama City on March 26, 2015, ahead of the VII Summit of the Americas to take place next April 10 and 11.  RODRIGO ARANGUA/AFP/Getty Images

Madison Chock and Evan Bates of the US attend the award ceremony of the ice dance of the 2015 ISU World Figure Skating Championships at Shanghai Oriental Sports Center in Shanghai, on March 27, 2015.  JOHANNES EISELE/AFP/Getty Images

Fishermen are seen returning to Bukavu dock after a night of fishing on March 26, 2015.  FEDERICO SCOPPA/AFP/Getty Images

A Syrian man looks at a dead horse lying in a destroyed street following air strikes by government forces helicopters on the eastern Shaar neighbourhood of the northern Syrian city of Aleppo on March 27, 2015.  AL-RIFAI/AFP/Getty Images