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Members of the Syrian Arab Red Crescent search for survivors amid the rubble of destroyed buildings following air strikes in the rebel-held town of Douma, on the eastern edges of the Syrian capital Damascus, on December 13, 2015. The Syrian Observatory for Human Rights said rockets fired by regime forces rained down on Douma, one of the largest towns in the opposition-held Eastern Ghouta region. AFP PHOTO / ABD DOUMANY / AFP / ABD DOUMANY (Photo credit should read ABD DOUMANY/AFP via Getty Images)

Members of the Syrian Arab Red Crescent search for survivors amid the rubble of destroyed buildings following air strikes in the rebel-held town of Douma, on the eastern edges of the Syrian capital Damascus, on December 13, 2015. The Syrian Observatory for Human Rights said rockets fired by regime forces rained down on Douma, one of the largest towns in the opposition-held Eastern Ghouta region. AFP PHOTO / ABD DOUMANY / AFP / ABD DOUMANY        (Photo credit should read ABD DOUMANY/AFP via Getty Images)