Two suicide bombers killed at least 11 military and police officers and wounded 19 north of Baghdad on October 30.
The attackers blew themselves up outside a Sunni militia leader's house as he was hosting a dinner.
The militia leader, Said Jassim, was not injured.
Elsewhere in Iraq, the Reuters news agency reports that, in the northern city of Mosul, a suicide bomber detonated a car packed with explosives near a police checkpoint in the west of the city.
Police and medical sources say at least eight people, including three police officers, were killed in the incident.
There was no immediate claim of responsibility for the attacks, but Al-Qaeda often deploys suicide bombers.
According to the monitoring group Iraq Body Count, more than 7,000 people have been killed in violence in Iraq so far this year.
Based on reporting by AP and Reuters