Two suicide bombers killed at least four Iraqi policeman and wounded 22 in separate attacks in the violence-wracked nation on Wednesday, security officials said.
In the first incident, a suicide bomber killed two policemen and wounded 12 more people in central Baghdad's Karrada district, defence and interior ministry officials said.
The bomber set off an explosive belt in the middle of a patrol, the sources said, adding that seven of the casualties were police.
In Mosul, 370 kilometres (230 miles) north of the capital, a suicide car bomb targeted a police roadblock, killing two police officials and wounding 10, including eight policemen, a security officer said.
Over the past year the security situation has improved dramatically in Iraq, but attacks remain common in Baghdad and in provinces such as Diyala and Nineveh, of which Mosul is the capital.