A Free Syrian Army fighter takes position close to a military base, near Azaz, Syria, Monday, Dec. 10, 2012. (AP Photo/Manu Brabo)

Report: US-Backed Syrian Rebels Engaged In ISIS-Style War Crimes

Amnesty International says Syrian rebel groups believed to be backed by the US, Saudi Arabia, Qatar and Turkey are responsible for abductions, torture and summary killings in north and north-western Syria.