A doctor treats a Syrian man suffering from breathing difficulties at a make-shift hospital in Aleppo after regime helicopters dropped barrel bombs on the rebel-held Sukkari neighbourhood of the northern Syrian city on September 6, 2016. The Britain-based Syrian Observatory for Human Rights said the bombs hit the Sukkari neighbourhood and that more than 70 people "most of them civilians" were treated for choking symptoms. (Photo by THAER MOHAMMED / AFP) (Photo by THAER MOHAMMED/AFP via Getty Images)
