The violence also wounded 40 people, interior ministry and security sources said.
In the Sunni-majority city of Khan Bani Saad just north of Baghdad, two bombs killed seven people and wounded three, all from the same Shiite family who had returned to their home after being displaced by the sectarian violence in the aftermath of the 2003 US-led invasion, a security official said.
A car bomb and two improvised bombs in the town of Fallujah, west of Baghdad, killed four policemen and two civilians, also wounding 25 other people, an interior ministry official said.
In Baghdad, a police lieutenant colonel was killed in his vehicle by an attacker using a gun fitted with a silencer, and his driver was also wounded.
In the Jisr Diyala area south of Baghdad, an improvised bomb killed three people and wounded 11.
Violence in Iraq is sharply down from its peak in 2006 and 2007, but bombings, shootings and kidnappings remain common.
The UN envoy to Iraq, Ad Melkert, said last week that violent incidents still occur on average 25 times per day, but acknowledged that the number was "a lot lower than what it used to be." (*)
Editor: Kunto Wibisono
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