The part that RD left out of the same article for some "unknown" reason:

http://www.msnbc.msn.com/id/18950252/
John Ward Anderson Washiungton Post

"I think this is going to be the end of the al-Qaeda presence here," Abdul Khaliq said of the fighting Wednesday and Thursday, which began over accusations that al-Qaeda in Iraq had executed Sunnis without reason.

The Baghdad battle is evidence of a deepening split between some Sunni insurgent groups and al-Qaeda in Iraq, which claims allegiance to Osama bin Laden. Although similar rebellions occurred in Diyala province earlier this year, the fighting this week appears to be the first time the conflict has reached the streets of Baghdad...."