FILE - In this Dec. 15, 2012 file photo, Free Syrian Army fighters look at the identity of a government troop killed during heavy clashes with government forces at a military academy be

 

              FILE - In this Dec. 15, 2012 file photo, Free Syrian Army fighters look at the identity of a government troop killed during heavy clashes with government forces at a military academy be
FILE - In this Dec. 15, 2012 file photo, Free Syrian Army fighters look at the identity of a government troop killed during heavy clashes with government forces at a military academy besieged by the rebels north of Aleppo, Syria. Syrian rebels are killing captured regime fighters and suspected informers with impunity, human rights groups say, pointing to mounting war crimes committed by those trying to topple President Bashar Assad. (AP Photo/Narciso Contreras, File)