A boy runs for cover after a mortar shell hit a street and killed several people in the Bustan Al-Qasr district of Aleppo, Syria, on Monday, Dec. 17, 2012. (AP Photo/Narciso Contreras)

Photo by: Narciso Contreras

A boy runs for cover after a mortar shell hit a street and killed several people in the Bustan Al-Qasr district of Aleppo, Syria, on Monday, Dec. 17, 2012. (AP Photo/Narciso Contreras)