Iraqi officials say several people have been killed in a suicide bombing at a police station just north of the capital, Baghdad.

The incident occurred Sunday in Tarmiyah when the bomber detonated his explosive vest. At least 12 people were wounded, many of them police officers.

Police and security personnel have become a frequent target of insurgents as Iraq prepares for the withdrawal of U.S. forces. The withdrawal is scheduled to be completed by the end of the year.