1/24Members of the Free Syrian Army stand behind a machine gun turret with a flag reading "There is no God but Allah and Mohammad is his messenger" in Aleppo's Bustan Al Qaser district, Syria, January 2, 2013.
2/24This citizen journalism image taken from video provided by Shaam News Network, which has been authenticated based on its contents and other AP reporting, shows a wounded man being pulled from the site of a Syrian government airstrike on a gas station in t
3/24In this image taken from video obtained from the Shaam News Network, which has been authenticated based on its contents and other AP reporting, A Free Syrian Army fighter stands on a vehicle as he holds his weapon in Taftanaz village, Idlib province, nort
8/24Forces loyal to Syria's President Bashar al-Assad stand near dead members of the Free Syrian Army who tried to attack the Air Defense Base in Tal Hassil, December 31, 2012.
9/24A Free Syrian Army fighter asks a child to move away from his house's window as a security measure in Aleppo's Bustan al-Qasr district December 30, 2012.
11/24U.N.-Arab League envoy to Syria Lakhdar Brahimi, left, shakes hands with Arab League Secretary-General Nabil Elaraby following a joint press conference at the Arab League headquarters in Cairo, Egypt, December 30, 2012.
13/24Free Syrian Army fighters fire at enemy positions during heavy clashes with government forces, in the Salaheddine district in Aleppo, December 29, 2012.
14/24Free Syrian Army fighters transport ammunition which was seized from government forces' Wadi al-Daif military base at Maaret al-Numan,in the Idlib governorate in the northwest of Syria, December 29, 2012.
20/24Men search for survivors after an air strike by a fighter jet loyal to Syrian President Bashar al-Assad in Azaz city, North Aleppo, December 29, 2012.
22/24A protester holds a sign during a demonstration against Syrian President Bashar al-Assad in Bustan al-Qasr, a district in Aleppo, Syria, December 28, 2012.
