tikrit. we re joined from aman jordan, with more on the battle against isis. with some of the successes aside, the sectarian at play with shia forces coming into a sunni citi, this is is serious stuff. reporter: very sensitive. a lot of concern about that. these are primarily, as ben mentioned, the force that is going into tikrit that is close to the city. these are primarily made up of shia militias. concern about what happens next. we have heard from rights groups and wash dog groups like human rights watchdog groups like human rights that sunni villages obviously on a smaller scale in different provinces, they say there were atrocities committed by militias like these. there s a lot of concerns about reprisal attacks and what happens next. we ve also heard from the top shia leadership in the country,