A Free Syrian Army fighter prepares to fire a B-10 recoilless gun in the Haresta neighborhood of Damascus, Feb. 7, 2013.

Free Syrian Army members raise an Islamic flag on a rooftop after heavy fighting with President Bashar al-Assad's forces, in the Jobar area of Damascus, Syria, Feb. 6, 2013.

A Free Syrian Army fighter walks in the Haresta neighborhood of Damascus Feb. 7, 2013.

Boys warm up next to a fire outside a building in the Ain Tarma neighborhood of Damascus, Feb. 5, 2013.

Rubble and damaged buildings in Daraya after what activists said was shelling by forces loyal to Syria's President Bashar al-Assad, Feb. 4, 2013. (Shaam News Network)

A member of the Free Syrian Army points his weapon through a hole in a wall as he takes up a defense position in Daraya Feb. 4, 2013. (Shaam News Network)

A man carries his sister who was wounded in a government airstrike in Ansari, in Aleppo, Feb. 3, 2013.

People carry a body after a government airstrike hit Ansari, Aleppo, Feb. 3, 2013.

This citizen journalism image provided by Aleppo Media Center shows people searching through the debris of destroyed buildings after airstrikes hit Ansari, Aleppo, Feb. 3, 2013.