An aerial view shows an Asiana Airlines airplane which ran out of runway after landing at Hiroshima airport in Mihara, Hiroshima prefecture, western Japan, in this photo taken by Kyodo April 15, 2015. An investigation has been launched after the Asiana Airlines passenger jet skidded off the runway after landing at Japan's Hiroshima airport on Tuesday, local media reported. The Airbus A320 jet was arriving from the South Korean capital of Seoul when it ran off the runway and slid onto an embankment shortly after 8pm local time (11:00 GMT). (Photo by Reuters/Kyodo News)

An aerial view shows an Asiana Airlines airplane which ran out of runway after landing at Hiroshima airport in Mihara, Hiroshima prefecture, western Japan, in this photo taken by Kyodo April 15, 2015. (Photo by Reuters/Kyodo News)

A woman wipes her head as she holds a water gun during the annual water-splashing festival in Xishuangbanna, Yunnan province, April 15, 2015. Thousands of people participated in the festival on Tuesday to celebrate the 1,377th ethnic Dai minority New Year, local media reported. (Photo by Reuters/Stringer)

A plantation worker scrapes rubber latex at Ham Nghi rubber forest in Huong Tra village, south of Hanoi, April 14, 2015. Picture taken on April 14, 2015. (Photo by Reuters/Kham)

Rubber latex is collected in a bowl at Ham Nghi rubber forest in Huong Tra village, south of Hanoi, April 14, 2015. Picture taken on April 14, 2015. (Photo by Reuters/Kham)

A man walks past “Red Walrus 2011”, made of dental composite resin, whiskers and brown glass eyes by Belgian artist Carsten Hoeller at the price of 90,000 Euros (95,300 US dollars) during the Art Cologne 2015 fair in Cologne April 15, 2015. Some 200 exhibitors from 23 countries are taking part in the 49th Art Cologne from April 16 to April 19, one of the world's leading fairs for progressive, post-war and contemporary art. (Photo by Wolfgang Rattay/Reuters)

Women walk past “Untitled” a polyester sculpture of an automobile of German sculpturer Thomas Rentmeister at the Art Cologne 2015 fair in Cologne April 15, 2015. (Photo by Wolfgang Rattay/Reuters)

Gallerists sit on a concrete bench showing a sleeping dog by Italian artist Alberto Garutti at the Art Cologne 2015 fair in Cologne April 15, 2015. The bench is part of a contemporary art project of the little Italian municipality of Trivero, northeast of Turin in the Piedmont region, portraying dogs that belong to Trivero families. (Photo by Wolfgang Rattay/Reuters)

Visitors walk past the sculpture “Star Sculpture”, acrylic color on Wawa wood of German sculpturer Stephan Balkenhol, at the Art Cologne 2015 fair in Cologne April 16, 2015. (Photo by Wolfgang Rattay/Reuters)

Visitors look at a 2.5m high stainless steel globe by late German artist Ernst Hermanns at the Art Cologne 2015 fair in Cologne April 16, 2015. (Photo by Wolfgang Rattay/Reuters)

A man walks past “Approximation (shoebill)”, a huge digital print on aluminium of an Internet-photo of a stork-like shoebill bird by Estonian artist Katja Novitskova at the Art Cologne 2015 fair in Cologne April 16, 2015. (Photo by Wolfgang Rattay/Reuters)

A woman walks past a mural in downtown Rome, April 15, 2015. (Photo by Tony Gentile/Reuters)

A man lies on a sun chair on a sunny spring day at Seegrube mountain in Innsbruck April 15, 2015. (Photo by Dominic Ebenbichler/Reuters)

A woman lies on a sun chair on a sunny spring day at Seegrube mountain in Innsbruck April 15, 2015. (Photo by Dominic Ebenbichler/Reuters)

A woman enjoys the view from Seegrube mountain on a sunny spring day in Innsbruck April 15, 2015. (Photo by Dominic Ebenbichler/Reuters)

A protester holds mock $15 bills as she participates in a “die in” demonstration for higher wages in the Manhattan borough of New York City April 15, 2015. Fast-food workers rallied on Wednesday for higher pay, using the April 15 tax deadline to publicize their claims that they cannot survive on the hourly wages paid by many U.S. corporations. (Photo by Lucas Jackson/Reuters)

An artist's impression of NASA's New Horizons spacecraft encountering Pluto and its largest moon, Charon, is seen in this NASA image from July 2015. The first spacecraft to visit distant Pluto, a dwarf planet in the solar system's frozen backyard, is still three months away from a close encounter, but already in viewing range, newly released photos show. (Photo by Reuters/NASA/Applied Physics Laboratory/Southwest Research Institute)

Actress Carey Mulligan signs a poster at the world premiere of “Far From the Madding Crowd” at the BFI Southbank in London, April 15, 2015. (Photo by Cathal McNaughton/Reuters)

Saudi army artillery fire shells towards Houthi movement positions at the Saudi border with Yemen April 15, 2015. (Photo by Reuters/Stringer)

Spanish matador Esau Fernandez waits before the start of a bullfight at The Maestranza bullring in the Andalusian capital of Seville, southern Spain April 15, 2015. (Photo by Marcelo del Pozo/Reuters)

A mobile phone is connected to Wi-Fi network on board a Norwegian Airways Boeing 737-800 at Berlin Schoenefeld Airport in this April 2, 2015 file photo. Panasonic Avionics says it will need to double the rate at which it installs Wi-Fi systems on aircaft if it is to catch up with skyrocketing demand from airlines to keep passengers connected above the clouds. (Photo by Pawel Kopczynski/Reuters)

A satellite antenna is seen on the roof of a Norwegian Airways Boeing 737-800 at Berlin Schoenefeld Airport in this April 2, 2015 file picture. (Photo by Pawel Kopczynski/Reuters)

An aerial view of flower fields is seen near the Keukenhof park, also known as the Garden of Europe, in Lisse, The Netherlands April 15, 2015. Keukenhof, employing some 30 gardeners, is considered to be the world's largest flower garden displaying millions of flowers every year. (Photo by Yves Herman/Reuters)

A woman hovers a mouse over the Google and European Union logos in Sarajevo, in this April 15, 2015 photo illustration. The European Union accused Google Inc on Wednesday of cheating competitors by distorting Internet search results in favour of its Google Shopping service and also launched an antitrust probe into its Android mobile operating system. (Photo by Dado Ruvic/Reuters)

Cheng Chen (L), a 27-year-old worker at a state-owned enterprise, helps his nephew to put on his home-made Iron Man armour in Xuzhou, Jiangsu province April 13, 2015. It cost Cheng about 500 yuan ($81 USD) to make the armour, which weighs about 4 kilograms, with plastic boards and LED lights, local media reported. (Photo by Reuters/Stringer)

Cheng Chen (R), a 27-year-old worker at a state-owned enterprise, poses for a photograph with his nephew who is wearing his home-made Iron Man armour, in Xuzhou, Jiangsu province April 13, 2015. (Photo by Reuters/Stringer)

A Russian-made Sukhoi Su-30MKV fighter jet of the Venezuelan Air Force flies over a Venezuelan flag tied to missile launchers, during the “Escudo Soberano 2015” (Sovereign Shield 2015) military exercise in San Carlos del Meta in the state of Apure April 15, 2015. (Photo by Marco Bello/Reuters)

A vendor arranges fish to dry on the side of the a road before delivering it to a wet market in Paranaque city, metro Manila, April 16, 2015. The vendor sells the dried fish at 20 pesos ($0.45) for every 10 pieces. (Photo by Romeo Ranoco/Reuters)

Old airplanes, including British Airways and China Airlines Boeing 747-400s and FedEx planes, are stored in the desert in Victorville, California, March 13, 2015. Last year, there were zero orders placed by commercial airlines for new Boeing 747s or Airbus A380s, reflecting a fundamental shift in the industry toward smaller, twin-engine planes. Smaller planes cost less to fly than the stately, four-engine jumbos, which can carry as many as 525 passengers. (Photo by Lucy Nicholson/Reuters)

Old airplanes, including British Airways and Air New Zealand Boeing 747-400s, are stored in the desert in Victorville, California March 13, 2015. (Photo by Lucy Nicholson/Reuters)

Old airplanes, including Boeing 747-400s, are stored in the desert in Victorville, California March 13, 2015. (Photo by Lucy Nicholson/Reuters)

Old airplanes, including British Airways Boeing 747-400s and FedEx planes, are stored in the desert in Victorville, California March 13, 2015. (Photo by Lucy Nicholson/Reuters)

A man plays minigolf underneath an overpass on a sunny spring day in Tokyo April 16, 2015. (Photo by Thomas Peter/Reuters)

Motorists stand still beside vehicles as a two-minute siren marking Holocaust Remembrance Day is sounded in Jerusalem April 16, 2015. Israel on Thursday marks its annual memorial day commemorating the six million Jews killed by the Nazis during World War Two. (Photo by Baz Ratner/Reuters)

A beach-goer stands still as a two-minute siren marking Holocaust Remembrance Day is sounded in Tel Aviv April 16, 2015. (Photo by Nir Elias/Reuters)

A man holds Israel's national flag as he stands still during the sounding of a two-minute siren marking Holocaust Remembrance Day in Jerusalem April 16, 2015. (Photo by Ammar Awad/Reuters)

Youths stand still on the beach as a two-minute siren marking Holocaust Remembrance Day is sounded in Tel Aviv April 16, 2015. (Photo by Nir Elias/Reuters)

A girl with an Israeli flag stands in between a barbed wire fences in at the former Nazi German Auschwitz-Birkenau death camp during the “March of the Living” at in Oswiecim, Poland on April 16, 2015. The annual march honours Holocaust victims at the former Nazi German Auschwitz-Birkenau death camp in southern Poland. (Photo by Janek Skarzynski/AFP Photo)

A 76-meter-high (249-feet) bronze-forged white Buddhist Avalokitesvara or Guan Yin statue, part of the Tsz Shan Monastery, stands behind luxurious houses at Taipo district in Hong Kong April 16, 2015. The monastery, officially opened to the public by reservation on April 15, 2015, received contribution of HK$1.7 billion ($219 million) from Hong Kong tycoon Li Ka-shing's personal foundation to cover the construction and daily operating costs, according to the monastery. (Photo by Bobby Yip/Reuters)

Air Force personnel spray water on an Indonesian F-16 to cool it down before moving it after it burned following an aborted take-off at Halim Air Base, East Jakarta April 16, 2015 in this photo taken by Antara Foto. Local media reported that the pilot was injured and hospitalised. (Photo by Rosa Panggabean/Reuters/Antara Foto)

Mercedes Alvarez, who is a member of the Solar Project Foundation for Nicaraguan Women (FUPROSOMUNIC), prepares food in a solar cooker on the outskirts of Masaya city April 15, 2015. The foundation manufactures solar cookers which benefit about 800 women in Nicaragua's agricultural sector, thus contributing actively towards improving the quality of life of women and their families, as well as preserving the environment through the use of solar energy. (Photo by Oswaldo Rivas/Reuters)

Alicia Ortega, who is a member of the Solar Project Foundation for Nicaraguan Women (FUPROSOMUNIC), prepares fruit to dehydrate on the outskirts of Masaya city April 15, 2015. (Photo by Oswaldo Rivas/Reuters)

Carmen Selva, who is a member of the Solar Project Foundation for Nicaraguan Women (FUPROSOMUNIC), prepares food in a solar cooker at Diriomo town April 15, 2015. (Photo by Oswaldo Rivas/Reuters)

A Ukrainian plane, the An-178, is seen as workers and guests look on during a presentation ceremony in Antonov Plant in Kiev April 16, 2015. According to a press release, the An-178 transport aircraft can be used for both military and civilian purposes and can carry 18 tons of cargo with the top speed over 800 km/h. (Photo by Valentyn Ogirenko/Reuters)

An Israeli policeman pushes an ultra-Orthodox Jewish protester after he tried to block a street in the town of Beit Shemesh, near Jerusalem April 16, 2015. Dozens of ultra-Orthodox Jewish protesters on Thursday demonstrated against construction at a site they believe contains ancient Jewish graves. (Photo by Ammar Awad/Reuters)

Gilbert, a three-year-old Briard breed, leaps on his owner Delores Dement of Memphis, Tennessee as they arrive to check into the Pennsylvania Hotel in New York City for the 136th Westminster Kennel Club Dog Show in this February 10, 2012 file photo. Researchers in Japan said on April 16, 2015 oxytocin, a hormone that among other things helps reinforce bonds between parents and their babies, increases in humans and their dogs when they interact, particularly when looking into one another's eyes. (Photo by Mike Segar/Reuters)