A tightropeEwalker performs on ropes stretched over the Emmaus Monastery in Prague, Czech Republic, April 1, 2019.

Pigeons fly in front of a large poster of Turkish President Tayyip Erdogan in Bursa, Turkey, April 6, 2019. Picture taken April 6, 2019.

A view shows a facility, where nearly 100 whales including orcas and beluga whales are held in cages, during a visit of scientists representing explorer and founder of the Ocean Futures Society Jean-Michel Cousteau in a bay near the Sea of Japan port of Nakhodka in Primorsky Region, Russia April 7, 2019. Picture taken April 7, 2019.

Identical twins Taiwo Adejare and Kehinde Adejare pose for a picture in Igbo Ora, Oyo State, Nigeria April 4, 2019. Picture taken April 4, 2019. REUTERS/Afolabi Sotunde - RC1883D3C010

A Sudanese demonstrator gestures while riding atop a military truck as he protests against the army's announcement that President Omar al-Bashir would be replaced by a military-led transitional council, near Defence Ministry in Khartoum, Sudan April 12, 2019.

Jan Agha, 49, an Afghan hunter, gives water to his cranes at a field in Bagram, Parwan province, Afghanistan April 10, 2019. Picture taken April 10, 2019.

An aerial view of tulip fields near the city of Creil, Netherlands April 18, 2019. Picture taken April 18, 2019.

ATTENTION EDITORS - VISUAL COVERAGE OF SCENES OF DEATH AND INJURY Crime scene officials inspect the site of a bomb blast inside a church in Negombo, Sri Lanka April 21, 2019.

Ukrainian presidential candidate Volodymyr Zelenskiy reacts following the announcement of the first exit poll in a presidential election at his campaign headquarters in Kiev, Ukraine April 21, 2019.

A girl refuses to have administered a cholera vaccination during a house-to-house immunization campaign in Sanaa, Yemen April 24, 2019.

2020 Democratic presidential candidate U.S. former Vice President Joe Biden quips that it's awkward to talk about foreign policy to reporters with an ice cream cone in his hand, at the Cone Shoppe during a two-day campaign kickoff in Monticello, Iowa, U.S. April 30, 2019.

Noel Womersley, from Canterbury Homekill butchery, poses with his Sako 85 hunting rifle at his farm outside Christchurch, New Zealand March 28, 2019.

Traders work on the floor at the New York Stock Exchange (NYSE) in New York, U.S., April 8, 2019.

Spectators watch from Jetty Park as booster rocket engines approach landing pads, after a SpaceX Falcon Heavy rocket, carrying the Arabsat 6A communications satellite, lifted off from the Kennedy Space Center in Cape Canaveral , Florida, U.S., April 11, 2019.

Athletics - London Marathon - London, Britain - April 28, 2019 Great Britain's Hayley Carruthers falls at the end of the women's elite race

A U.S. Border Patrol agent searches for undocumented migrants after they illegally crossed the Rio Grande near Palmview, Texas, U.S., April 6, 2019. Picture taken April 6, 2019.

Fire fighters douse flames of the burning Notre Dame Cathedral in Paris, France April 15, 2019.

White House Advisor Ivanka Trump dances as she meets women entrepreneurs, at the demonstration cocoa farm in Adzope, Ivory Coast April 17, 2019.

A wooden wheel which has been stuffed with straw and set alight rolls down a hill during the celebration of the traditional 'Osterraederlauf' in Luegde, Germany, April 21, 2019.

Chinese Navy's destroyer Taiyuan takes part in a naval parade off the eastern port city of Qingdao, to mark the 70th anniversary of the founding of Chinese People's Liberation Army Navy, China, April 23, 2019.

A young attendee handles a handgun during the National Rifle Association (NRA) annual meeting at the Indiana Convention center in Indianapolis, Indiana, U.S., April 26, 2019.

White House adviser Kellyanne Conway speaks to reporters at the White House in Washington, U.S., April 30, 2019.

Diane Cohen, 64, who was forced to leave her home when the Kilauea Volcano erupted and covered it with lava last summer, plants a coconut tree on her property in Kapoho, in Hawaii, U.S., April 1, 2019. Picture taken April 1, 2019.

A "Baby Trump" balloon floating during a protest against U.S. President Donald Trump visit to Calexico, California, as seen from Mexicali, Mexico April 5, 2019. Image used for illustrative purpose.

WikiLeaks founder Julian Assange arrives at the Westminster Magistrates Court, after he was arrested in London, Britain April 11, 2019.

A dancer poses for her own photographer in front of pink cherry tree blossoms during a sunny spring morning at the Parc de Sceaux gardens near Paris, France, April 12, 2019.

Formula One F1 - Chinese Grand Prix - Shanghai International Circuit, Shanghai, China - April 13, 2019 Toro Rosso's Alexander Albon after crashing during practice

Athletics - Paris Marathon - Paris, France - April 14, 2019 General view during the men's elite race

Golf - Masters - Augusta National Golf Club - Augusta, Georgia, U.S. - April 14, 2019. Tiger Woods of the U.S. celebrates on the 18th hole to win the 2019 Masters.

A transparent cup containing what Israeli scientists from Tel Aviv University say is the world's first 3D-printed, vascularised engineered heart, is seen during a demonstration at a laboratory in the university, Tel Aviv, Israel April 15, 2019. Image used for illustrative purpose.

Smoke rises around the altar in front of the cross inside the Notre Dame Cathedral as a fire continues to burn in Paris, France, April 16, 2019.

Mwamini Kahindo, an Ebola survivor working as a caregiver to babies who are confirmed Ebola cases, holds an infant outside the red zone at the Ebola treatment centre in Butembo, Democratic Republic of Congo, March 25, 2019. Picture taken March 25, 2019.

Swedish environmental activist Greta Thunberg cries at the end of her speech to the environment committee of the European Parliament in Strasbourg, April 16, 2019.

Sudanese demonstrators try to beat a man who they think is a government agent, as soldiers try to take him out of the crowd in Khartoum, Sudan April 16, 2019.

U.S. Attorney General William Barr, flanked by Edward O'Callaghan, Acting Principal Associate Deputy Attorney General (L) and Deputy U.S. Attorney General Rod Rosenstein, speaks at a news conference to discuss Special Counsel Robert Mueller’s report on Russian interference in the 2016 U.S. presidential race, in Washington, U.S., April 18, 2019.

Police officers detain a climate change activist at Oxford Circus during the Extinction Rebellion protest in London, Britain April 18, 2019.

A protester reacts at a demonstration during Act XXIII (the 23rd consecutive national protest on Saturday) of the yellow vests movement in Paris, France, April 20, 2019.

Boxing - Teofimo Lopez v Edis Tatli - Madison Square Garden, New York, U.S. - April 20, 2019. Teofimo Lopez and Edis Tatli in action.

A woman reacts to the sun coming out of the clouds during the annual Easter Parade and Bonnet Festival on Fifth Avenue in New York City, New York, U.S. April 21, 2019.

A person in an Easter Bunny costume looks on as U.S. President Donald Trump attends the 2019 White House Easter Egg Roll in Washington, U.S., April 22, 2019.

A stroller abandoned by Central American migrants is seen after an immigration raid in their journey towards the United States, in Pijijiapan, Mexico April 22, 2019.

Firefighters tackle a fire on a patch of moorland above the village of Uppermill, Britain, April 22, 2019.

An artisanal miner climbs out of a gold mine with a bag of rocks broken off from inside the mining pit at the unlicensed mining site of Nsuaem Top in Ghana, November 24, 2018. Picture taken November 24, 2018.

India's Prime Minister Narendra Modi waves towards his supporters during a roadshow in Varanasi, India, April 25, 2019. REUTERS/Adnan Abidi

North Korean leader Kim Jong Un arrives at the railway station before his departure in Vladivostok, Russia April 26, 2019.

Giant male panda Xiao Liwu eats a meal of bamboo at the San Diego Zoo prior to his repatriation to China with his mother Bai Yun, bringing an end to a 23-year-long panda research program in San Diego, California, U.S., April 18, 2019.

ATTENTION EDITORS - VISUAL COVERAGE OF SCENES OF INJURY OR DEATH An opposition demonstrator is struck by a Venezuelan National Guard vehicle on a street near the Generalisimo Francisco de Miranda Airbase "La Carlota" in Caracas, Venezuela April 30, 2019.