A Peshmerga fighter holds a rocket propelled-grenade (RPG) near an ISIS flag hoisted on the other side of a bridge in Rashad, on the road between Kirkuk and Tikrit, on Sept. 11, 2014. [JM LOPEZ/AFP/Getty Images]

Sunni tribes turning on ISIS and Peshmerga

Peshmerga are under attack by Sunni tribal forces – but it's unclear if they are allied with ISIS or a new Iraqi army-backed militia.