Tikrit was overrun by IS last June and several hundred militants are believed to be holding out there.
The pro-government force ranged against them includes about 3,000 Iraqi troops with 20,000 Shia militiamen and a much smaller force of Sunni tribesmen.
Tikrit is a majority Sunni city, yet the bulk of the fighting is being done my Shia militia, whom outnumber even government troops nearly 7 to 1.
also troubling -
A prominent Iraqi Sunni preacher has urged authorities to prevent Shia militias from carrying out revenge attacks on Sunnis in Saddam Hussein’s hometown as they fight alongside government forces to oust Islamic State extremists.
Sheikh Abdel Sattar Abdul Jabbar cited reports of Shia militiamen burning Sunni homes in the battle to win back Tikrit from Isis, and said that if the government failed to stop revenge attacks the country would face renewed sectarian tensions.
http://www.theguardian.com/world/2015/m ... cks-tikrit
The implications here for Iraq's Sunni Arabs are not good. Stuff like this may force them in the coming months to rally behind ISIS to a greater degree than they have in the past.
http://www.vice.com/en_uk/video/fightin ... te-trailer