A policeman shows his badge while approaching a man who had just shot himself in front of the Capitol in Washington DC, as tourists react April 11, 2015. A man shot himself dead near the U.S. Capitol on Saturday, police said, sparking a temporary security lockdown at the complex on one of the busiest days for tourists in Washington. (Photo by Evan El-Amin/Reuters)

Kim Kardashian, a US reality TV star walks inside Armenian St. James Cathedral in Jerusalem Monday, April 13, 2015. Kim Kardashian, along with husband West, their daughter, North West, and her sister, Khloe, arrived to Israel on a private visit. (Photo by Mahmoud Illean/AP Photo)

Workers clean the bronze statue of King Sejong at Gwanghwamun Plaza in Seoul, South Korea, Monday, April 13, 2015, King Sejong, the fourth king of the Joseon Dynasty (1392-1910), created the Korean alphabet, hangeul, in 1446. (Photo by Ahn Young-joon/AP Photo)

Artist an exhibition director Peter Luckner makes final touches to a model of a straight-tusked elephant (Palaeoloxodon antiquus) for the permanent exhibition “Fossil Richness in the Geisel Valley” in the Pfaennerhall Factory in Braunsbedra, central Germany, Thursday, April 16, 2015. The 4 meter (13 ft) tall model represents a forest elephant which lived in the Geisel Valley 200,000 years ago. (Photo by Jens Meyer/AP Photo)

A volunteer from the Badr Brigade militia cleans his weapon on the frontline with ISIS fighters on April 11, 2015 in Ebrahim Ben Ali, in Anbar Province, Iraq. (Photo by John Moore/Getty Images)

In this photo provided by Orange County, Calif., Animal Care, veterinarians in Lake Forest, Calif., attend to a goose with an arrow piercing its neck after its capture in Anaheim, Calif., Wednesday, April 15, 2015. A worker at the Anaheim Hills Car Wash befriended the goose several days ago and was able to catch it and turn it over to officers from Orange County Animal Care, department spokeswoman Katie Ingram said. Veterinarians at an area bird and wildlife clinic examined the bird and said it appeared to be in good health, except for the arrow that missed all its vital organs, Ingram said. (Photo by Orange County Animal Care via AP Photo)

A Papuan boy stands at a stall selling spices at a market in Wanam, Papua province, Indonesia, Thursday, April 16, 2015. (Photo by Dita Alangkara/AP Photo)

Members of the Oxford University rowing boat crew throw their cox Will Hakim into the River Thames as they celebrate their win against Cambridge University at the end of the Boat Race on the River Thames, London, Saturday April 11, 2015. Oxford beat Cambridge in the men's and women's Boat Races on Saturday as one of England's oldest sporting events gave equal billing to both genders for the first time. (Photo by Anthony Devlin/AP Photo/PA Wire)

Members of the human statue street performer group named “Tokyo Hack” get shoppers' attention as they march in Tokyo's Ginza shopping district Sunday, April 12, 2015. The main street in Ginza shuts the traffic and opens for shoppers during the day on Sundays. (Photo by Shizuo Kambayashi/AP Photo)

People watch the launch of a model rocket during a celebration of the 54th anniversary of Russia's Yuri Gagarin's first manned flight into space, in St. Petersburg, Russia, Sunday, April 12, 2015. (Photo by Dmitry Lovetsky/AP Photo)

Fans of Stuttgart burn flares prior to the Bundesliga match between VfB Stuttgart and SV Werder Bremen at Mercedes-Benz Arena on April 12, 2015 in Stuttgart, Germany. (Photo by Alex Grimm/Bongarts/Getty Images)

A flock of twenty swans and a few geese parade from their winter home to the Avon River in Stratford, Ontario, Sunday, April 12, 2015. Hundreds of people came to watch the annual spring swan parade. (Photo by Dave Chidley/The Canadian Press via AP Photo)

A flock of twenty swans and a few geese parade from their winter home to the Avon River in Stratford, Ontario, Sunday, April 12, 2015. (Photo by Dave Chidley/The Canadian Press via AP Photo)

NHK World mascot Domo poses with the crowd at the 55th annual Sakura Matsuri during the Cherry Blossom Festival on Saturday, April 11, 2015 in Washington, D.C. Sakura Matsuri celebrates the blooming of the cherry blossom trees, a gift to the U.S. from Japan. (Photo by Paul Morigi/AP Images for NHK WORLD TV)

Russian Orthodox Patriarch Kirill, left, talks to President Vladimir Putin, right, during the Easter service in Christ the Savior Cathedral in Moscow, Russia, early Sunday, April 12, 2015. (Photo by Ivan Sekretarev/AP Photo)

Patriarch of Moscow and All Russia Kirill's mitre casts a shadow on the face of Russian President Vladimir Putin as he attends an Orthodox Easter service in the Christ the Saviour Cathedral in Moscow April 12, 2015. (Photo by Ivan Sekretarev/Reuters)

A Mercedes vintage car is on display at the “Techno Classica” trade fair in the western German city of Essen on April 16, 2015. The car show, which is the world's biggest car fair where car are on sale, takes place from April 15 to April 19, 2014. (Photo by Patrik Stollarz/AFP Photo)

A member of the guard of honor lies on the ground while French President Francois Hollande, rear right, and his Swiss counterpart Simonetta Sommaruga inspect the guard of hounor in Bern, Switzerland, Wednesday, April 15, 2015. French President Francois Hollande is on a two-day official visit in Switzerland. (Peter Klaunzer/Keystone via AP Photo)

In this photo taken Tuesday, April 14, 2015, immigrant men armed with machetes make their way onto a Durban, South Africa, street during clashes with police and in search of locals that attacked foreign shop owners in the city center. (Photo by Tebogo Letsie/AP Photo)

In this photo taken in Durban, South Africa, on Tuesday, April 14, 2015, an immigrant armed with a machete on a street during clashes with police and in search of locals that attacked foreign shop owners in the city center. (Photo by Tebogo Letsie/AP Photo)

In this photo taken Tuesday, April 14, 2015, an immigrant armed with a petrol bomb on a Durban, South Africa, street during clashes with police and in search of locals that attacked foreign shop owners in the city center. (Photo by Tebogo Letsie/AP Photo)

A man begs for money as he sits by a mural on a shop window in Rome, Thursday, April 16, 2015. (Photo by Gregorio Borgia/AP Photo)

Denali, a Great Pyrenees, wears a sign reading “Thank you for helping my brother”, as he sits next to Hudson Scheck, background, of Ball Ground, Ga., after Georgia Gov. Nathan Deal signed a medical marijuana bill into law at the Statehouse, Thursday, April 16, 2015, in Atlanta. Denali and Hudson have been together since Hudson was born and helps to detect his seizures. The bill makes Georgia the 38th state to have one and legalizes possession of cannabis oil for treatment of certain medical conditions. (Photo by David Goldman/AP Photo)

A member of a bomb squad checks a small helicopter after a man landed on the West Lawn of the Capitol in Washington, Wednesday, April 15, 2015. Police arrested a man who steered his tiny, one-person helicopter onto the West Lawn of the U.S. Capitol Wednesday, astonishing spring tourists and prompting a temporary lockdown of the Capitol Visitor Center. Capitol Police didn't immediately identify the pilot or comment on his motive, but a Florida postal carrier named Doug Hughes took responsibility for the stunt on a website where he said he was delivering letters to all 535 members of Congress in order to draw attention to campaign finance corruption. (Photo by Manuel Balce Ceneta/AP Photo)

A Shiite rebel, known as a Houthi, chews qat leaves, an amphetamine-like stimulant, as he guards a near the site of a demonstration against an arms embargo imposed by the U.N. Security Council on Houthi leaders, in Sanaa, Yemen, Thursday, April 16, 2015. Al-Qaida's branch in Yemen seized Thursday control of a major airport and sea port and oil terminal in southern Yemen, consolidating their hold of the country's largest province amid wider chaos that is pitting Shiite rebels against forces loyal to the country's exiled president and a Saudi-led air campaign. (Photo by Hani Mohammed/AP Photo)

A player juggles before a match in Kinshasa on April 11, 2015. (Photo by Federico Scoppa/AFP Photo)

Saudi army artillery fire shells towards Yemen from a post close to the Saudi-Yemeni border, in southwestern Saudi Arabia, on April 13, 2015. Saudi Arabia is leading a coalition of several Arab countries which since March 26 has carried out air strikes against the Shiite Huthis rebels, who overran the capital Sanaa in September and have expanded to other parts of Yemen. (Photo by Fayez Nureldine/AFP Photo)

Labour leader Ed Miliband arrives to address supporters during the party's launch of it's 2015 election manifesto at the Old Granada TV studios on April 13, 2015 in Manchester, England. (Photo by Christopher Furlong/Getty Images)

An unidentified passer-by pulls the driver from a SUV to safety after the vehicle left Mayfair Drive, traveled downhill and was stopped by a chain link fence just short of a 30-foot vertical drop onto the Bryden Canyon Road, Wednesday, April 15, 2015, in Lewiston, Idaho. (Photo by Barry Kough/Lewiston Tribune via AP Photo)

Oleg Neydenov Russian trawler being towed out to sea after a fire broke out on board while it was moored at Las Palmas port on the Spanish Gran Canaria island. The Russian boat that had been accused of illegal fishing sank near the Canary Islands on April 15, 2015, without causing casualties, Spanish rescuers said. (Photo by Salvamento Maritimo/AFP Photo)

Two of four human skeletons dating back to the 5,000-year-old Harappan era which have been recovered are pictured at a burial mound at Rakhigarhi village in Hisar on March 11, 2015 Four complete human skeletons – two men, one woman and a child – thought to date back some 5,000 years have been discovered in an ancient village in northern India, archaeologists said on April 15, 2015. (Photo by Manoj Dhaka/AFP Photo)

A Jamaican Rastafarian known as Nature smokes marijuana outside the Trench Town Culture Yard Museum in downtown Kingston, Jamaica, Wednesday, April 15, 2015, where he works as a tour guide. Nature, like most adherents of the Rastafarian movement, said he smokes for spiritual purposes. Drug law amendments decriminalizing small amounts of pot and paving the way for a lawful medical marijuana sector came into effect Wednesday in Jamaica. (Photo by David McFadden/AP Photo)

A man dressed as a ancient Roman centurion walks by the Colosseum in the center of Rome on April 15, 2015. (Photo by Filippo Monteforte/AFP Photo)

In this photo taken Friday April 10, 2015, Cong Langui, 53, creates a six-square-meter chalking drawing of Leonardo da Vinci's masterpiece, the Mona Lisa, also known as La Gioconda, on the street of Jinhua in east China's Zhejiang province. Cong who lost his left leg to a bone tumor in his youth draws to earn a living on the streets. (Photo by AP Photo/Stringer)

Christian pilgrims hold candles at the church of the Holy Sepulcher, traditionally believed to be the burial site of Jesus Christ, during the ceremony of the Holy Fire in Jerusalem's Old City, Saturday, April 11, 2015. Thousands of Christians have gathered in Jerusalem for the ancient fire ceremony that celebrates Jesus' resurrection. (Photo by Dan Balilty/AP Photo)

Fans try to grab a ball before the Los Angeles Angels' home opener baseball game against the Kansas City Royals, Friday, April 10, 2015, in Anaheim, Calif. (Photo by Jae C. Hong/AP Photo)

In this Monday, April 13, 2015, photo, mixed martial arts fighter Paige VanZant does some shadow boxing as she works out in preparation for an Ultimate Fighting Championship bout, at Ultimate Fitness in Sacramento, Calif. VanZant, 21, is scheduled to fight Felice Herrig in an Ultimate Fighting Championship strawweight match in New Jersey on Saturday. (Photo by Rich Pedroncelli/AP Photo)

In this Monday, April 13, 2015, photo, mixed martial arts fighter Paige VanZant works out in preparation for her Ultimate Fighting Championship bout, at Ultimate Fitness in Sacramento, Calif. (Photo by Rich Pedroncelli/AP Photo)

In this Monday, April 13, 2015, photo, mixed martial arts fighter Paige VanZant, right, spars with Sarah Jamila at Ultimate Fitness in Sacramento, Calif. (Photo by Rich Pedroncelli/AP Photo)

Revelers, covered in coloured powder, celebrate, during a Holi Run Festival in Madrid, Spain, Sunday, April 12, 2015. Thousands of revelers took part in the festival that includes a mini marathon. The festivals are fashioned after the Hindu spring festival Holi, which is mainly celebrated in the north and east of India. (Photo by Andres Kudacki/AP Photo)

A child plays on the floor covered with clouded power, at the end of a mini marathon during a Holi Run Festival in Madrid, Spain, Sunday, April 12, 2015. (Photo by Andres Kudacki/AP Photo)

A small boat crosses in front of an oil drilling rig as it arrives aboard a transport ship, following a journey across the Pacific, Friday, April 17, 2015, in view of the Olympic Mountains in Port Angeles, Wash. The 400-foot Polar Pioneer was due to be off-loaded in Port Angeles, on the Olympic Peninsula, to have equipment installed. About three dozen protesters took to the water, many of them in kayaks, as the rig arrived in harbor at 7 a.m. The rig will later come to Seattle for further staging. (Photo by Daniella Beccaria/Seattlepi.com via AP Photo)

Protesters in kayaks are dwarfed as they paddle to meet an oil drilling rig as it arrives aboard a transport ship, following a journey across the Pacific, Friday, April 17, 2015, in Port Angeles, Wash. (Photo by Daniella Beccaria/Seattlepi.com via AP Photo)

A small boat carrying protesters heads out at dawn to meet an oil drilling rig on its arrival Friday, April 17, 2015, in Port Angeles, Wash. (Photo by Daniella Beccaria/Seattlepi.com via AP Photo)

An oil drilling rig arrives aboard a transport ship, following a journey across the Pacific, Friday, April 17, 2015, in view of the Olympic Mountains in Port Angeles, Wash. (Photo by Daniella Beccaria/Seattlepi.com via AP Photo)

An oil drilling rig arrives aboard a transport ship, following a journey across the Pacific, Friday, April 17, 2015, in view of the Olympic Mountains in Port Angeles, Wash. (Photo by Daniella Beccaria/Seattlepi.com via AP Photo)