Officials in northern Iraq say a suicide bomber has killed at least 11 people during the funeral procession for an anti-al-Qaida fighter. Another 25 people were wounded.
The attack took place Sunday at a cemetery in Wajihyah, north of Baghdad.
The victims were mourning Mudher al-Shallal, the son of a prominent pro-government Sunni Muslim sheikh. The son was killed in an attack the night before.
The father had set up a local Sahwa militia that supported U.S. forces in their fight against al-Qaida militants in Iraq.
There was no immediate claim of responsibility for the bombing, but Iraqi troops and Sahwa fighters have been targeted frequently by Sunni insurgents, who consider them traitors.
In a separate incident on Sunday, gunmen shot dead another Sunni sheikh, Khalid Hammoud al-Jumaili, in the western city of Fallujah, where he had led anti-government demonstrations.
Sunni protest camps sprang up across Iraq earlier this year against what many Sunnis consider second-class citizen treatment by the Shi'ite-led government.
A crackdown on one such camp in April set off a wave of violence in which the United Nations says more than 5,500 people have been killed.