An aerial view shows erosion marks on sand and stone, on the beach along the Atlantic Ocean coast, in Soulac, France, April 12, 2018. Picture taken April 12, 2018.

Palestinian cyclist Alaa Al-Daly, 21, who lost his leg by a bullet fired by Israeli troops, stands next to his bicycle at his house in Rafah, southern Gaza Strip, April 18, 2018.

Tourists cross the Windsor Bridge in the British overseas territory of Gibraltar, historically claimed by Spain April 18, 2018.

An Israeli girl plays with an inflatable hammer during celebrations marking Israel's 70th Independence Day in the southern city of Ashkelon, Israel April 18, 2018.

Bill Gates speaks during an interview with Reuters in London, Britain, April 18, 2018.

U.S. Navy Lieutenant Tammie Jo Shults, who is currently a Southwest Airlines pilot, poses in front of a Navy F/A-18A in this 1992 photo released in Washington, DC, U.S., April 18, 2018.

Limar and Masa al-Qari, child survivors of the suspected poison gas attack, walk outside a tent for the displaced, in the Northern Aleppo countryside, Syria April 17, 2018. Picture taken April 17, 2018.

Boxing - Carl Frampton & Nonito Donaire Public Work-Outs - Victoria Square Shopping Centre, Belfast, Britain - April 18, 2018 Carl Frampton is seen posing through a mirror after a press conference

Tennis - ATP - Monte Carlo Masters - Monte-Carlo Country Club, Monte Carlo, Monaco - April 18, 2018 A bead of sweat drops off of Spain's Rafael Nadal as he prepares to serve during his second round match against Slovenia's Aljaz Bedene

Spanish big wave surfer Axi Muniain drops in on a large wave at Praia do Norte in Nazare, Portugal, April 18, 2018. Reuters/Rafael Marchante

Former FBI Director James Comey arrives to speak about his book "A Higher Loyalty" in New York, U.S., April 18, 2018.

Pink flamingos frolic in their enclosure at the Madrid zoo in Madrid, Spain, April 18, 2018. Image used for illustrative purposes

Workers stand on rubble of damaged buildings in Raqqa, Syria April 18, 2018.

Britain's Prince Harry's fiancee Meghan Markle attends a reception with delegates from the Commonwealth Youth Forum at the Queen Elizabeth II Conference Centre, London, April 18, 2018. Yui Mok/Pool via Reuters

New York City Police (NYPD) officers sit during their graduation ceremony at Madison Square Garden in New York City, U.S., April 18, 2018.

German Chancellor Angela Merkel smiles as she attends the weekly cabinet meeting at the chancellery in Berlin, Germany, April 18, 2018.

Britain's Prime Minister Theresa May welcomes Canada's Prime Minister Justin Trudeau to 10 Downing Street in London, Britain, April 18, 2018.

A worker cleans the floor of the newly built Islamabad International Airport, during a media tour ahead of its official opening, Pakistan April 18, 2018.

U.S. NTSB photo shows a part of the engine cowling from the Southwest Airlines plane which blew its engine in mid air yesterday over the skies of Philadelphia, Pennsylvania, U.S., in this image released on April 18, 2018