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A Syrian woman carries children following airstrikes on a rebel area of the war-torn northern city of Aleppo on December 15, 2013. The Aleppo Media Centre, an activist network on the ground, reported several helicopter attacks on rebel areas of the city, once Syria's economic hub. AFP PHOTO / MOHAMMED AL-KHATIEB (Photo credit should read MOHAMMED AL-KHATIEB/AFP/Getty Images)

A Syrian woman carries children following airstrikes on a rebel area of the war-torn northern city of Aleppo on December 15, 2013. The Aleppo Media Centre, an activist network on the ground, reported several helicopter attacks on rebel areas of the city, once Syria's economic hub. AFP PHOTO / MOHAMMED AL-KHATIEB        (Photo credit should read MOHAMMED AL-KHATIEB/AFP/Getty Images)