Residents look at smoke rising from the explosion site at Mexican national oil company Pemex's Pajaritos petrochemical complex in Coatzacoalcos, Veracruz state, Mexico, April 20, 2016. (Photo by Angel Hernandez/Reuters)





Ground crew prepare for the departure of the Solar Impulse 2 solar plane from the Kalaeloa Airport, Thursday, April 21, 2016, in Kapolei, Hawaii. The Solar Impulse team landed in the islands in July after a record-breaking flight from Japan. (Photo by Marco Garcia/AP Photo)





In this photo released on March 20, 2014 by the U.S. Navy, patrol coastal ship USS Typhoon launches a surface-to-surface missile during Griffin missile exercise to guard against small boat threats in the U.S. 5th Fleet Area of responsibility. A U.S. Navy investigative report obtained by The Associated Press shows a Navy officer relieved of commanding a Persian Gulf patrol ship failed to maintain equipment to the point of exposing “his crew to unnecessary risk”, interfered with an inquiry into his actions and once slept drunk on a bench at a Dubai port. The report outlines the allegations against the officer's actions, whom the Navy removed from the USS Typhoon in March. (Photo by Mass Communication Specialist 1st Class Doug Harvey/U.S. Navy via AP Photo)





Teresita Gapayao, 51, a scavenger for 12 years, wades through garbage using a makeshift raft made from styrofoam on the Estero de Vitas tiver in Tondo, Manila on April 21, 2016. Gapayao collects plastic bottles and anything that can be sold to junkshops as a living earning an average of 3 USD a day. The annual Earth Day event which will be celebrated on April 22, marking its 46th year, is a global movement calling for environmental protection. (Photo by Noel Celis/AFP Photo)





Teresita Gapayao, 51, a scavenger for 12 years, wades through garbage using a makeshift raft made from styrofoam on the Estero de Vitas tiver in Tondo, Manila on April 21, 2016. (Photo by Noel Celis/AFP Photo)





Britain's Queen Elizabeth II is seen walking in the private grounds of Windsor Castle on steps at the rear of the East Terrace and East Garden with four of her dogs: clockwise from top left Willow (corgi), Vulcan (dorgie), Candy (dorgie) and Holly (corgi), in this official photograph released by Buckingham Palace to mark her 90th birthday, April 20, 2016. (Photo by Annie Leibovitz/Reuters)





Miniature artist Chen Forng-Shean poses with his latest work, a miniature portrait of Taiwanese president-elect Tsai Ing-wen on a grain of rice, in Taipei, Taiwan April 18, 2016. The Chinese characters read, “Modest, modest and even more modest”. (Photo by Tyrone Siu/Reuters)





Sculptor Pedro Francisco Rodriguez touches his 16-feet bronze statue of Pope Francis, to be displayed to the public in May, at his workshop in Ciudad Juarez, Mexico, April 20, 2016. (Photo by Jose Luis Gonzalez/Reuters)





Filipino government workers cover their heads with their hands during a nationwide simultaneous earthquake drill, in Taguig, south of Manila, Philippines, 21 April 2016. The Philippine government held the drill to test the local community's disaster risk reduction and management plans, as well as to strengthen the commitment of local government units in building safer communities. (Photo by Francis R. Malasig/EPA)





Residents cover their heads with their hands during a simultaneous earthquake drill inside the police headquarters in Quezon city, metro Manila April 21, 2016. (Photo by Romeo Ranoco/Reuters)





A PETA (People for the Ethical Treatment of Animals) activist with her body painted promotes veganism in Bangkok April 21, 2016. (Photo by Jorge Silva/Reuters)





Catholic nuns from the Missionaries of Charity arrive to cast their votes during the third phase of West Bengal Assembly elections in Kolkata, India, April 21, 2016. (Photo by Rupak De Chowdhuri/Reuters)





An exhibitor checks stock information on a mobile phone behind humanoid robot Jiajia produced by University of Science and Technology of China is displayed at an exhibition stage during the 4th China (Shanghai) International Technology Fair 2016 in Shanghai, China, April 21, 2016. (Photo by Aly Song/Reuters)





Humanoid robot Jiajia produced by University of Science and Technology of China is displayed at an exhibition stage during the 4th China (Shanghai) International Technology Fair 2016 in Shanghai, China, April 21, 2016. (Photo by Aly Song/Reuters)





Shinto priests holding traditional umbrellas walk to the main shrine for a ritual to cleanse themselves during the annual Spring Festival at the Yasukuni Shrine in Tokyo, Japan, April 21, 2016. (Photo by Issei Kato/Reuters)





Climate activist demonstrate in front of Le Meridien Etoile Hotel during the International Oil Summit in Paris, France, April 21, 2016. (Photo by Jacky Naegelen/Reuters)





Workers wash a statue of Soviet state founder Vladimir Lenin, on the eve of the 146th anniversary of his birth, in Krasnoyarsk, Siberia, Russia, April 21, 2016. (Photo by Ilya Naymushin/Reuters)





Priestesses attend the Olympic flame lighting ceremony for the Rio 2016 Olympic Games inside the ancient Olympic Stadium on the site of ancient Olympia, Greece, April 21, 2016. (Photo by Yannis Behrakis/Reuters)





Priestesses and dancers attend the Olympic flame lighting ceremony for the Rio 2016 Olympic Games inside the ancient Olympic Stadium on the site of ancient Olympia, Greece, April 21, 2016. (Photo by Alkis Konstantinidis/Reuters)





A man taps a fan dressed as the Iron Man character on the shoulder after a news conference at Bangkok Entertainment Week 2016 at Bangkok Art and Culture Centre (BACC), Thailand, April 21, 2016. (Photo by Athit Perawongmetha/Reuters)





A fan dressed as the Iron Man character prepares backstage before a news conference at Bangkok Entertainment Week 2016 at Bangkok Art and Culture Centre (BACC), Thailand, April 21, 2016. (Photo by Athit Perawongmetha/Reuters)





A migrant disembarks from a merchant ship in the Sicilian harbour of Augusta, Italy, April 21, 2016. (Photo by Tony Gentile/Reuters)





People walk along a decorated street in central Moscow, Russia, April 21, 2016. (Photo by Grigory Dukor/Reuters)





A woman is seen on a decorated street in central Moscow, Russia, April 21, 2016. (Photo by Grigory Dukor/Reuters)





Men jokingly present themselves as TV crew in front of burning blankets in a field near a makeshift camp for migrants and refugees at the Greek-Macedonian border near the village of Idomeni, Greece, April 21, 2016. (Photo by Stoyan Nenov/Reuters)





A sand sculpture is erected in front of the Bolshoi Theatre in central Moscow, Russia, April 21, 2016. (Photo by Grigory Dukor/Reuters)





A bird flies near a torn Syrian national flag in the city of Qamishli, Syria April 21, 2016. (Photo by Rodi Said/Reuters)





French riot policemen attend an attack drill at the Pierre Mauroy stadium in Villeneuve d'Ascq, France, April 21, 2016 in preparation of security measures for the UEFA 2016 European Championship. (Photo by Pascal Rossignol/Reuters)





Musician Prince (L) performs for members of the news media in Miami Beach, Florida February 1, 2007. U.S. pop star Prince, the 57-year-old whose hits included “Purple Rain” and “Kiss”, was found unresponsive on Thursday at his Minnesota home and was later declared dead, U.S. media reports said. (Photo by Brian Snyder/Reuters)





Knoxville, a trained service dog, sleeps at the feet of retired U.S. Army soldier Stefan LeRoy, who was injured in Afghanistan in 2012, during a U.S. House Military Veterans Caucus briefing on legislation promoting service dogs for military veterans on Capitol Hill in Washington April 21, 2016. (Photo by Jonathan Ernst/Reuters)





Ultra-Orthodox Jews take part in the “Mayim Shelanu” ceremony to collect water from a natural spring, near Jerusalem April 21, 2016. The water is used to make matza, the traditional unleavened bread to be eaten on the Jewish holiday of Passover which starts on Friday. Passover commemorates the flight of Jews from ancient Egypt, as described in the Exodus chapter of the Bible. (Photo by Ronen Zvulun/Reuters)





A police officer tapes off the area around two people who were killed when a bike lane collapsed in Rio de Janeiro, Brazil, Thursday, April 21, 2016. Part of an elevated bike lane built ahead of the Olympic Games collapsed on Thursday, killing at least two people who were on it when cement gave way and crashed onto the beach below. (Photo by Felipe Dana/AP Photo)





Eliane reacts next to the body of her husband Eduardo Marinho Albuquerque, 54, who according to relatives, was exercising at a new cycle lane when part of it collapsed under crashing ocean waves, in Rio de Janeiro, Brazil, April 21, 2016. (Photo by Ricardo Moraes/Reuters)





The collapsed area of the new cycle lane is pictured in Rio de Janeiro, Brazil, April 21, 2016. (Photo by Ricardo Moraes/Reuters)





A resident (C), who was trying to pass a blocked area near of part of the new cycle lane which collapsed under crashing ocean waves, clashes with municipal guards in Rio de Janeiro, Brazil, April 21, 2016. (Photo by Ricardo Moraes/Reuters)





A volunteer medical doctor offers his services to people in Pedernales, after an earthquake struck off Ecuador's Pacific coast, April 21, 2016. (Photo by Guillermo Granja/Reuters)





Secret service agents talk in the foreground as Canadian Prime Minister Justin Trudeau spars in the ring at Gleason's Boxing Gym in the Brooklyn borough of New York, U.S., April 21, 2016. (Photo by Carlo Allegri/Reuters)





Spanish fishermen eat on a beach while an outline of the Queen Elizabeth II is seen projected on the Rock of the British Colony of Gibraltar to celebrate her 90th birthday, from La linea de la Concepcion, southern Spain April 21, 2016. (Photo by Jon Nazca/Reuters)





A man bends iron rebar to recycle, at a post-earthquake debris field in Manta, Ecuador, Wednesday, April 20, 2016. Ecuadoreans began burying loved ones felled by the country's deadliest earthquake in decades, while hopes faded that more survivors will be found. (Photo by Rodrigo Abd/AP Photo)





Children play on a destroyed fighter plane in Juba on April 21, 2016. Fragile hopes for an end to South Sudan's civil war are being tested by the rebel leader's failure to return to the capital to form a unity government. International pressure is growing after Riek Machar, a former rebel leader turned deputy president who was fired, became a rebel leader again and has now fought his way back to the vice presidency, failed to appear in Juba as expected on April 18 or 19. (Photo by Carl de Souza/AFP Photo)





Russian President Vladimir Putin (back, C) speaks during a ceremony to present newly appointed to senior command posts officers at the St George Hall in the Grand Kremlin Palace in Moscow, Russia, 21 April 2016. (Photo by Alexei Druzhinin/EPA/Sputnik/Kremlin)





Police guard Polio vaccination team, a day after seven policemen who were on security duty to Polio vaccination team were killed by unknown gunmen in Karachi, during a three-day vaccination campaign in Karachi, Pakistan, 21 April 2016. Pakistan is one of the last two countries – along with Afghanistan – where the polio is still endemic, meaning infections occur within the local population or within a particular area. Though new polio cases dropped to a nine-year low in 2015, attacks by Islamist militants against health workers and police guarding them remained a challenge for a UN-funded vaccination campaign. Only 51 children were found infected with the crippling virus in 2015 compared to 306 a year earlier in what officials said a major achievement due to the success of a military offensive. (Photo by Shahzaib Akber/EPA)





People walk around “The Starry Paradise”, a recreation of Van Gogh’s painting “The Starry Night” made from discarded plastic bottles at the Embrace Cultural and Creative Park in Keelung, Northern Taiwan, 21 April 2016. The recreated Van Gogh painting is made from four million discarded plastic bottles that covers 53 hectares of the park. The installation cost 90 million Taiwan dollars (2.5 Million Euro) that aims to promote environmental protection. (Photo by Ritchie B. Tongo/EPA)





People walk around “The Starry Paradise”, a recreation of Van Gogh’s painting “The Starry Night” made from discarded plastic bottles at the Embrace Cultural and Creative Park in Keelung, Northern Taiwan, 21 April 2016. (Photo by Ritchie B. Tongo/EPA)





Two participants from Imatong and Terekeka counties take part of the South Sudan National Wrestling Competition for peace at Juba Stadium, on April 20, 2016. South Sudan is holding a “wrestling for peace” tournament, bringing together athletes from around the country. The last big tournament was canceled when civil war broke out in December 2013. (Photo by Albert Gonzalez Farran/AFP Photo)





This picture taken on April 20, 2016 shows French former overall Ski World Cup winner and race car driver Luc Alphand skiing down a big sand dune during an off-road mapping recognition excercise ahead of the Silk Way Rally 2016 in the Gobi desert, some 2,000 kms (1250 miles) northwest of Beijing. The 2016 Silk Way Rally takes place in July and will see competitors race from Moscow's Red Square to the Chinese capital Beijing. (Photo by Nicolas Asfouri/AFP Photo)





A handout photo released by the European Space Agency shows the Bubble Nebula, also known as NGC 7653, which is an emission nebula located 11 000 light-years away. This stunning new image was observed by the NASA/ESA Hubble Space Telescope to celebrate its 26th year in space. (Photo by AFP Photo/ESA/Hubble)





A boy oversees a “spider match” on one of Manila's city streets on April 21, 2016. The winning spider must totally engulf its opponent in its web. (Photo by Noel Celis/AFP Photo)





A lampost given to Stratford by the people of Israel stands outside the Royal Shakespear Company on April 19, 2016 in Stratford-upon-Avon, England. 2016 will see the 400th anniversary of William Shakespeare's death and is to be marked with events and special projects in Stratford-upon-Avon and around the world. His birthday will also be celebrated on 23rd April with a procession through Stratford. The “Bard of Avon” is considered by many as the world's greatest playright, poet and writer. (Photo by Christopher Furlong/Getty Images)





Frankie Dettori celebrates after riding So Mi Dar to win The Investec Derby Trial at Epsom racecourse on April 20, 2016 in Epsom, England. (Photo by Alan Crowhurst/Getty Images)