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A picture taken on September 14, 2015 shows smoke billowing from the Syrian rebel-held area of Douma, east of the capital Damascus, following a reported air strike by Syrian government forces. The besieged area east of Syria's capital suffered one of its bloodiest months in August, with 'intense' regime bombing attacks that killed and wounded hundreds, Doctors Without Borders said. Last month, 117 people were killed in a single day of government air strikes on the town of Douma in Eastern Ghouta, causing a global outcry. AFP PHOTO / ABD DOUMANY (Photo credit should read ABD DOUMANY/AFP/Getty Images)

A picture taken on September 14, 2015 shows smoke billowing from the Syrian rebel-held area of Douma, east of the capital Damascus, following a reported air strike by Syrian government forces. The besieged area east of Syria's capital suffered one of its bloodiest months in August, with 'intense' regime bombing attacks that killed and wounded hundreds, Doctors Without Borders said. Last month, 117 people were killed in a single day of government air strikes on the town of Douma in Eastern Ghouta, causing a global outcry. AFP PHOTO / ABD DOUMANY        (Photo credit should read ABD DOUMANY/AFP/Getty Images)