Shia fighters deny revenge attacks on Sunnis in Iraq

Shia militia in Iraq have made gains in the south and northwest against fighters from the Islamic State in Iraq and Levant (ISIL).

But some have been accused of killing Sunni civilians in revenge attacks, a claim the groups deny.

Al Jazeera has been given exclusive access to one of the militias in Salahudeen province - as the group prepares for an assault on the ISIL stronghold of Tikrit.

Al Jazeera's Imran Khan reports from Salahudeen province.