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. / AFP PHOTO / THAER MOHAMMED (Photo credit should read THAER MOHAMMED/AFP/Getty Images)
