School children hold candles and placards during a vigil for the soldiers who were killed after gunmen attacked an Indian army base in Kashmir's Uri on Sunday, in Agartala, India, September 19, 2016. REUTERS/Jayanta Dey

Syrian refugee children play at Azraq refugee camp for Syrians displaced by conflict, near Al Azraq city, Jordan, September 9, 2016. REUTERS/Muhammad Hamed

Traders work at their desks in front of the German share price index, DAX board, at the stock exchange in Frankfurt, Germany, September 7, 2016. REUTERS/Staff/Remote

A United Parcel Service (UPS) truck on delivery is pictured in downtown Los Angeles, California October 29, 2014. REUTERS/Mike Blake

People speak together near a logo of Airbus Group during the Airbus annual news conference in Colomiers, near Toulouse, January 13, 2015. REUTERS/Regis Duvignau/File Picture

An employee works at a Tmall logistic centre in Suzhou, Jiangsu province, China, October 28, 2015. Picture taken October 28, 2015. REUTERS/Aly Song/File Photo

An employee works at a Tmall logistic centre in Suzhou, Jiangsu province, China, October 28, 2015. REUTERS/Aly Song/File Photo

Free Syrian Army fighters launch a Grad rocket from Halfaya town in Hama province, towards forces loyal to Syria's President Bashar al-Assad stationed in Zein al-Abidin mountain, Syria September 4, 2016. REUTERS/Ammar Abdullah