The pro-government militiamen had gathered Wednesday outside a military post in the city west of Baghdad to collect their pay when a suicide bomber wearing an explosive vest detonated himself near the group, killing at least three of the fighters and a civilian. Police said the blast also wounded 15 people.
The Sahwa fighters are made up of Sunni Arabs who joined forces with the U.S. military to battle al-Qaida at the height of Iraq’s insurgency. They have since been regularly targeted by Sunni insurgents who see them as traitors.
In a separate attack in Baghdad, a car bomb in the eastern suburb of al-Husseiniyah killed four civilians and wounded 10 more.
Another car bomb north of the city of Ramadi – which, like Fallujah, is in Iraq’s restive Anbar province – killed at least two policemen and wounded another 10.
Wednesday’s attacks follow a wave of violence that killed scores of Iraqis in April, raising fears of a return to the sectarian violence that left tens of thousands dead in 2006 and 2007.