A suicide bomber rammed his car into a bus full of policemen north of Baghdad today, killing at least five and seriously injuring another 13, a hospital source said.
The bus was taking about 20 policemen to a Kurdish city in the north for training when the attack took place.
A Reuters reporter saw seven badly burned wounded policemen at the hospital.
The area around Baquba, 65 km (40 miles) northeast of Baghdad has been a hotbed of violence lately, with frequent attacks against Iraqi security forces and civilians.
Insurgents stormed a police checkpoint with rocket-propelled grenades and mortars in a small town near Baquba a week ago, killing five policemen and wounding four.
Poorly equipped Iraqi security forces are an attractive target for assaults by insurgent groups like al Qaeda in Iraq, who have stepped up their campaign of violence after largely peaceful elections two weeks ago.