A parked car bomb detonated on Tuesday in Baghdad's upscale Mansour neighbourhood, killing at least six people and wounding 18 others, police said.
Iraqi forces cordoned off the area in western Baghdad. Police had no further details on the explosion.
Violence overnight and on Tuesday resulted in at least 24 people being killed around Iraq, police and military officials said.
In Middadiyah, a town just outside Baqouba northeast of the capital, a roadside bomb next to a market killed at least four people and wounded 24 others, police said.
It was the second attack in the Baqouba area following an attack late on Monday by gunmen who assaulted a Shiite mosque in a town with mortars and assault rifles, killing seven people and wounding three.
In northern Mosul, gunmen attacked and killed four unidentified Kurds and injured another, said Ahmed Abdul-Aziz, a doctor at of Jumhouri Hospital.
A roadside bomb targeting a police patrol exploded in eastern Baghdad's Zaiyouna neighbourhood in eastern Baghdad, wounding three police officers and a civilian, police said.
Gunmen killed police brigadier Ziad Ramzi central Mosul city. The officer was in plain clothes when he was shot, said Nineveh police brigadier Saeid Ahmeed.
Two armed men were killed and four Iraqi soldiers were injured in a firefight between Iraqi forces and gunmen in the Qadisiyah area in eastern Rawah, 275 kilometers northwest of Baghdad, the Iraqi military said.