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A Syrian man carries a bicycle amid the rubble of destroyed buildings following a reported air strike by Syrian government forces in the rebel-held area of Douma, east of the capital Damascus, on October 21, 2015. AFP PHOTO / SAMEER AL-DOUMY / AFP / SAMEER AL-DOUMY (Photo credit should read SAMEER AL-DOUMY/AFP via Getty Images)

A Syrian man carries a bicycle amid the rubble of destroyed buildings following a reported air strike by Syrian government forces in the rebel-held area of Douma, east of the capital Damascus, on October 21, 2015. AFP PHOTO / SAMEER AL-DOUMY / AFP / SAMEER AL-DOUMY        (Photo credit should read SAMEER AL-DOUMY/AFP via Getty Images)