CentCom's Gen. Austin: Iran-backed Shiite militia not in Tikrit fight (w/video)

WASHINGTON — Iranian-backed Shiite militias have left the northern Iraqi city of Tikrit, a key condition the U.S. demanded before it agreed to begin launching airstrikes Wednesday to support Iraqi forces and try to retake the city from the Islamic State group, the top U.S. general for the Middle East said Thursday.