This citizen journalism image provided by Aleppo Media Center AMC which has been authenticated based on its contents and other AP reporting, shows members of the free Syrian Army hiding behind scrap metal during an attack against Syrian government forces, in the neighborhood of al-Amerieh in Aleppo, Syria, Sunday, April. 21, 2013. (AP Photo/Aleppo Media Center AMC)

Photo by: HOEP

This citizen journalism image provided by Aleppo Media Center AMC which has been authenticated based on its contents and other AP reporting, shows members of the free Syrian Army hiding behind scrap metal during an attack against Syrian government forces, in the neighborhood of al-Amerieh in Aleppo, Syria, Sunday, April. 21, 2013. (AP Photo/Aleppo Media Center AMC)