A car bomb in the central Iraqi town of Dhuluiya on Sunday killed at least seven policemen and wounded two more, the town's police chief told AFP.
Lieutenant Colonel Mohammed Khalid said the explosion occurred at around 7:30 am (0430 GMT) in the town 70 kilometres (43 miles) north of Baghdad in the central Sunni province of Salaheddin.
"The police received a call that there was an abandoned car on a road. A team of policemen went to check and as they reached the car it exploded," Khalid said.
The latest attack came as the Salaheddin authorities on Sunday gave insurgents until July 8 to surrender to US and Iraqi forces.
Last month around 500 combatants turned themselves in as part of a national reconciliation programme.
The American military has said it expects another 500 insurgents to give up their arms in Salaheddin.
The province has been a hotbed of Sunni Arab insurgency led by loyalists of executed dictator Saddam Hussein whose home town was Tikrit, the capital of Salaheddin.
Militants of Al-Qaeda in Iraq have also fuelled the anti-US insurgency in the province.