FILE -- In this Saturday, Oct. 20, 2012 file photo, a rebel fighter stands guard at a check point flying an Islamic banner near the frontline in the Bustan al-Qasr neighborhood of Alepp

 

              FILE -- In this Saturday, Oct. 20, 2012 file photo, a rebel fighter stands guard at a check point flying an Islamic banner near the frontline in the Bustan al-Qasr neighborhood of Alepp
FILE -- In this Saturday, Oct. 20, 2012 file photo, a rebel fighter stands guard at a check point flying an Islamic banner near the frontline in the Bustan al-Qasr neighborhood of Aleppo, Syria. Activists said on Saturday, July 13, 2013 that Syrian rebels and fighters from an al-Qaida-linked group have turned their guns on each other and are fighting for control of a key checkpoint in the northern city of Aleppo. The checkpoint is the only gateway between rebel-held eastern districts and the city's western areas, controlled by President Bashar Assad's troops. (AP Photo/Narciso Contreras, File)