Insurgents killed at least nine people across Iraq on Saturday, while police found 11 corpses of men shot dead in apparent sectarian killings, security officials said.
The US military also announced that three of its soldiers were wounded in a bomb attack in Baghdad.
A string of explosions rocked Baghdad early on Saturday killing at least four people and wounding dozens, security officials said.
Most of the attacks appeared to have targeted security forces, including a large car bomb in Zayuna that went off as a US patrol passed but killed only two Iraqi bystanders, interior ministry spokesman Brigadier Abdul Karim Khalaf said.
In the central Baghdad neighbourhood of Waziriyah, a man attempted to ram his car into a police station and was shot, but not before he detonated the explosives in the vehicle, killing a policeman and wounding 10 other people.
Smaller blasts in other parts of the capital wounded another half-dozen civilians, Khalaf added.
Gunmen opened fire on two employees of the state-owned Sabah newspaper as they drove to work, killing one and wounding the other, a security official said.
Insurgents also set off a bomb against a US Humvee jeep in Baghdad's eastern Jadida neighbourhood in which three soldiers were wounded, the military said.
In the northern oil city of Kirkuk, twin blasts killed four people and wounded 16.