Iraqi police--at this point almost entirely Shiite. Murders of Sunnis by Shiite militia in the Iraqi police--no hard facts that I know of. But US commanders have been told of being called by the Iraqi police to fights in Sunni mosques--always Sunni, never Shiite. People are killed. And the cause of the disturbance is never clear.

I bet you can find articles (on the problem of killing of Sunnis by Shiite militias in the police) on the net. Maliki has often promised to purge the Shiite militias in the police--and there's been no follow-through that I know of.

My source--as usual, the WSJ.