The former mayor of London and Vote Leave campaigner Boris Johnson wears protective equipment as he visits Reid Steel during a campaign stop in Christchurch, England, on May 12, 2016. #

Tires burn in an uncontrolled dump near the town of Sesena, after a fire broke out early on May 13, 2016. A huge waste ground near Madrid where millions of tires have been dumped burned Thursday, releasing a thick black cloud of toxic fumes that officials worry could harm residents nearby. #

Bad weather surrounds a Boeing 767 airplane as it arrives onto Enniscrone beach after it was tugged from Shannon Airport out to sea around the west coast of Ireland, on May 7, 2016. It is destined for local funeral director David McGowan's proposed Glamping Village to be used as accommodation in Sligo, Ireland. #

A man walks along a street as a smoke bomb is thrown during clashes between ‘No border’ activists and Italian police at the Brenner train station on May 7, 2016, during demonstrations against Austria's possible decision to close the border with Italy. #

Russian servicemen march during the Victory Day parade, marking the 71st anniversary of the victory over Nazi Germany in World War II, at Red Square in Moscow, Russia, on May 9, 2016. #

Activists of right-wing Hindu Sena, or Hindu Army, conduct Hindu rituals to ensure a win for U.S. presidential candidate Donald Trump in New Delhi, India, on May 11, 2016. While Trump has dominated the Republican primary race to decide the party's candidate for the November election, his calls for temporarily banning Muslims from America and cracking down on terrorist groups abroad have earned him some fans in India. #

Emergency forces and shoppers take part in a simulated terror attack at the Trafford Center in Manchester, England, on May 10, 2016. Police in Greater Manchester joined forces with other agencies to carry out a simulated terror attack to test the emergency response to a major incident. #

A pilgrim walks on her knees to fulfill her vows, as pilgrims attend the 99th anniversary of the appearance of the Virgin Mary to three shepherd children, at the Catholic shrine of Fatima, Portugal, on May 12, 2016. #

LED lights attached to pigeons leave light trails in the sky while they fly during the ‘Fly By Night’ art installation by Duke Riley above Brooklyn, New York, on May 5, 2016. #

A man stands on the roof of one of the buildings in the capital's main ceremonial square before a mass dance and torchlight procession, a day after the ruling Workers' Party of Korea wrapped up its first congress in 36 years, in Pyongyang, North Korea, on May 10, 2016. #

Irish Air Corps deliver maintenance and repair supplies to Dun Aonghasa, a pre-historic stone fort dated from 1100 B.C. on the remote Aran Islands in Galway, Ireland, on May 13, 2016. #

A jet airliner leaves a vapor trail as the planet Mercury is seen, lower left quadrant, transiting across the face of the sun in Las Vegas, Nevada, on May 9, 2016. Mercury passes between Earth and the sun only about 13 times a century, with the previous transit taking place in 2006. #

Visitors shout during their visit to the Quinta Nova da Assuncao mansion, where Reflexo theatre company performs the show Casa Assombrada, or haunted house, in Belas, near Sintra, Portugal. During a tour of the empty Quinta Nova da Assuncao mansion, there are apparitions, shadows, and the sound of doors randomly shutting. All accompanied by the terrified shrieks from the group of visitors. #

A two-week old pygmy hippopotamus (Choeropsis liberiensis) undergoes a routine medical check in its enclosure in Szeged Nature Reserve in Szeged, Hungary, on May 10, 2016. #

A boy plays with a machine gun during an event in remembrance of the upcoming Victory Day, marking the anniversary of the Allied victory over Nazi Germany, in the southern city of Ashdod, Israel, on May 7, 2016. #

A 500-meter (1,640-foot) aperture spherical telescope (FAST) is seen in the final stages of construction, among the mountains in Pingtang County, Guizhou province, China, on May 7, 2016. #

An opposition supporter falls as she clashes with Venezuelan National Guards during a rally to demand a referendum to remove President Nicolas Maduro in Caracas, Venezuela, on May 11, 2016. #

A reveler takes part in Correfoc in Barcelona, Spain, on May 7, 2016. Correfoc, or fire-run, originates from a form of medieval street theater that represents the fight of good against evil through parades using fireworks and effigies of the devil. During the Correfoc, a group of individuals dress as devils and light fireworks. While dancing to the drums, they will set off their fireworks among crowds of spectators. #

A soldier films military officers following a mass dance performance in the capital's main ceremonial square, a day after the ruling Workers' Party of Korea wrapped up its first congress in 36 years, in Pyongyang, North Korea, on May 10, 2016. #