Free Syrian Army fighters fire at enemy positions during heavy clashes with government forces in the Salaheddine district of Aleppo, Syria, on Saturday, Dec. 29, 2012. (AP Photo/Abdullah Al-Yasin)

Photo by: Abdullah Al-Yasin

Free Syrian Army fighters fire at enemy positions during heavy clashes with government forces in the Salaheddine district of Aleppo, Syria, on Saturday, Dec. 29, 2012. (AP Photo/Abdullah Al-Yasin)