In this photo, taken on Tuesday, October 30, 2012, a rebel fighter belonging to the Liwa Al-Fatah takes cover as he targets his enemy position from a school building during skirmishes with the Syrian army in the nearby Bustan Al-Pasha front line in Aleppo, Syria's largest city. (AP Photo/Narciso Contreras).
In this Tuesday, Oct. 30, 2012 photo, a rebel fighter belonging to the Liwa Al-Fatah takes cover as he aims on his enemy position from a school building during skirmishes with the Syrian army in the nearby Bustan Al-Pasha front line in Aleppo, Syrian's largest city. (AP Photo/Narciso Contreras).