At least eight Iraqi policemen have been killed in a suicide bomb attack in the centre of the Iraqi capital.
Car bombs are a constant threat in Iraq
The bomber targeted a joint army and police checkpoint in the Karrada district, injuring another 25 people - thought to all be civilians.
Another four people were killed in a bomb attack outside a factory in Iskandariya - a centre of the anti-US insurgency south of Baghdad - earlier.
The US says murders and executions in Iraq have been cut by more than half.
In its quarterly report, the US military said sectarian violence was Iraq's greatest threat.
US military spokesman Maj Gen William Caldwell said "there has been an over 50% reduction in murders and executions".
However, car bombs continue to pose a major threat to security in Baghdad and surrounding areas, the military said.
Police reports say Thursday's explosion in Iskandariya happened outside one of the few factories still operating in Iraq.