1This citizen journalism image provided by The Syrian Revolution against Bashar Assad shows a Syrian military tank on fire during clashes with Free Syrian army fighters in Joubar, a suburb of Damascus, Sept. 18, 2013.
2A Syrian opposition fighter rests inside a cave at a rebel camp in the Idlib province countryside, Sept. 17, 2013.
3This citizen journalism image provided by Edlib News Network shows Syrian rebels with damaged cars after a car bomb exploded at a crossing point near Syria's border with Turkey, Sept. 17, 2013.
4A member of the Shohadaa Badr Brigade, which operates under the Free Syrian Army, stands in shooting position behind sandbags in Ashrafieh, Aleppo, September 17, 2013.