ISIS stealing cars to flee as Iraqi soldiers enter stronghold of Tikrit . The U.S. military said it was not aware that the vehicles were being used by ISIS.
ISIS stealing cars to flee as Iraqi soldiers enter stronghold of Tikrit . Iraqi forces closing in on city centre that has been held by ISIS since June . Retaking ISIS stronghold vital if forces are to force ISIS out of Mosul . Mosul is the terror group 's Iraqi power base and is 140 miles north of Tikrit .