Iraqi officials say a suicide bomber in a wheelchair has attacked a police station near the capital, Baghdad, killing at least two people and wounding 18 others.

Authorities say the bomber blew himself up at the entrance to the police compound in the central town of Tarmiyah on Sunday. At least nine of those wounded were policemen.

In another incident, police say a bomb went off Sunday near a car carrying the mayor of the northern Iraqi town of Riyadh in Kirkuk province. Two people were wounded, but the mayor was unharmed.

Iraqi police and security personnel have become a frequent target of insurgents as the Iraqi government prepares for a withdrawal of U.S. forces that is scheduled to be completed by the end of this year.