Damaged aid trucks are pictured after an airstrike on the rebel held Urm al-Kubra town, western Aleppo city, Syria September 20, 2016. REUTERS/Ammar Abdullah

Damaged Red Cross and Red Crescent medical supplies lie inside a warehouse after an airstrike on the rebel held Urm al-Kubra town, western Aleppo city, Syria September 20, 2016. REUTERS/Ammar Abdullah

Traders work on the floor of the New York Stock Exchange (NYSE) in New York City, U.S., September 15, 2016. REUTERS/Brendan McDermid

The former Anglican archbishop of Cape Town Desmond Tutu waits to receive the 2013 Templeton Prize at the Guildhall in central London in this file photo dated May 21, 2013. REUTERS/Paul Hackett/File Photo

Smoke rises from Taybat al Imam town after rebel fighters from the hardline jihadist Jund al-Aqsa advanced in the town in Hama province, Syria August 31, 2016. REUTERS/Ammar Abdullah

Roofers work on new homes at a residential construction site in the west side of the Las Vegas Valley in Las Vegas, Nevada April 5, 2013. REUTERS/Steve Marcus

Virginia registered voters cast their ballot at a "In-Person Absentee Voting" location at McLean Governmental Center in McLean, Virginia, U.S. on October 25, 2008. REUTERS/Hyungwon Kang/File Photo

A Touch Screen Voting Machine displays the final button to complete casting a ballot at a "In-Person Absentee Voting" location at McLean Governmental Center in McLean, Virginia, U.S. on October 25, 2008. REUTERS/Hyungwon Kang/File Photo