The probe comes after a US general revealed the arrest of 22 policemen allegedly on a mission to kill a Sunni.
"We have found one of the death squads. They are part of the police force," US Maj Gen Joseph Peterson said. Sunnis have long accused Iraqi forces of operating death squads - but the claims have never been substantiated.
Just more evidence that we are in the middle of a civil war, and again our side is using death squads to terrorize the population.
Iraq Death Squad