Police officers block the access to the Champs Elysees near the Arc de Triomphe in Paris after a shooting on April 20, 2017. One police officer was killed and another wounded today in a shooting on Paris's Champs Elysees, police said just days ahead of France's presidential election. France's interior ministry said the attacker was killed in the incident on the world famous boulevard that is popular with tourists. Ludovic MARIN / AFP

A Nepali boy whose body is covered with mud looks on in his village on the outskirts of Biratnagar after the area was hit by flood, some 240 kms from Nepal's capital Kathmandu, on August 16, 2017.  At least 221 people have died and more than 1.5 million have been displaced by monsoon flooding across India, Nepal and Bangladesh, officials said on August 15, as rescuers scoured submerged villages for the missing. In Nepal, severe flooding has left tens of thousands of homes totally underwater in the populous southern lowlands, with nearly 20 percent of the population affected. PRAKASH MATHEMA / AFP

People stroll amid flowers blooming in the Huasco region on the Atacama desert, some 600 km north of Santiago, on August 26,2017. A gigantic mantle of multicolored flowers covers the Atacama Desert, the driest in the world. In years of very heavy seasonal rains a natural phenomenon known as the Desert in Bloom occurs, making the seeds of some 200 desert plants to germinate suddenly some two months after the precipitations. MARTIN BERNETTI / AFP

Fighters of the Hashed Al-Shaabi (Popular Mobilization units) advance through a street in the town of Tal Afar, west of Mosul, after the Iraqi government announced the launch of the operation to retake it from Islamic State (IS) group control, on August 26, 2017. AHMAD AL-RUBAYE / AFP

New Zealand's captain Kieran Read (L) leads the Haka during the second Bledisloe Cup match between New Zealand and Australia under their Rugby Championship test, at Forsyth Barr Stadium in Dunedin on August 26, 2017. Marty MELVILLE / AFP

Boxer Floyd Mayweather Jr. (L) and MMA figher Connor Mcgregor pose during their weigh- in on August 25, 2017, in Las Vegas, Nevada.   Mayweather, the 40-year-old undefeated former welterweight boxing champion, will face McGregor, a star of mixed martial arts' Ultimate Fighting Championship, in a 12-round contest under boxing rules on August 26. John GURZINSKI / AFP

A man walks past graffiti depicting US President Donald Trump on the controversial Israeli separation barrier separating the West Bank town of Bethlehem from Jerusalem on August 25, 2017. THOMAS COEX / AFP

German Chancellor Angela Merkel chats with Nyima Jadama from Gambia during a meeting of refugee students in Berlin, on August 25, 2017.   TOBIAS SCHWARZ / AFP

Gorilla "Mjukuu" and her baby "Alika" check out a measuring device in an enclosure during a photocall at London Zoo on August 24, 2017, to promote the zoo's annual weigh-in event. During the weigh-in, animals across the zoo have their vital statistics recorded including their height and weight and the information is then shared with zoos across the world to help zookeepers compare important information on thousands of endangered species. CHRIS J RATCLIFFE / AFP

An aerial photo taken on August 24, 2017 shows apartment buildings in Samara. Samara will host several matches during the FIFA World Cup 2018. Mladen ANTONOV / AFP

Japan Ground Self-Defense Forces tanks and armoured vehicles advance during an annual live-fire exercise at the Higashi-Fuji firing range in Gotemba, at the foot of Mount Fuji in Shizuoka prefecture on August 24, 2017. The annual drill involves some 2,400 personnel, 80 tanks and armoured vehicles and some 20 aircraft and helicopters. Toshifumi KITAMURA / AFP

A woman uses her phone while wearing a plastic poncho along Victoria Harbour during heavy winds and rain brought on by Typhoon Hato in Hong Kong on August 23, 2017. Typhoon Hato smashed into Hong Kong on August 23 with hurricane force winds and heavy rains in the worst storm the city has seen for five years, shutting down the stock market and forcing the cancellation of hundreds of flights. Anthony WALLACE / AFP

French Olympic Judo champion Teddy Riner speaks with journalists after a training at the French National Institute for Sport and Physical Education (INSEP) in Paris on August 23, 2017 ahead of the World Championships in Budapest.   PATRICK KOVARIK / AFP

German Chancellor Angela Merkel awaits the start of the weekly cabinet meeting in Berlin, on August 23, 2017. TOBIAS SCHWARZ / AFP

US President Donald Trump speaks at a "Make America Great Again" rally in Phoenix, Arizona, on August 22, 2017. Nicholas Kamm / AFP

A grasshopper sits in the blossom of a hibiscus in Ludwigsburg, southwestern Germany, on August 22, 2017. THOMAS KIENZLE / AFP

A displaced child from the Islamic State (IS) group's Syrian stronghold of Raqa, walks to attend the first day of the new school year at a camp for internally displaced people in Ain Issa on August 22, 2017.   Delil souleiman / AFP