On FOX they said that Iraq didn’t inform U.S. of their plans to take back Tikrit because they are working with the Iranians.
The Shi’ite Iraqis are most certainly working with the Shi’ite Iranians against the Sunni ISIS. Of course, after they extricate ISIS, a similar level of brutality won’t be far behind, just executed by Shi’ites instead of Sunnis.