The bloodletting also wounded dozens more as the authorities struggle to grapple with the country's worst unrest since 2008, when it was just emerging from a brutal Sunni-Shiite sectarian war that killed tens of thousands and displaced countless others.
In today's deadliest incidents, shelling by government forces in Fallujah and clashes in and around the city killed 15 people and wounded 40, according to Ahmed Shami, the chief medic at the city's main hospital.
Security forces have periodically shelled neighbourhoods of Fallujah in recent months, arguing that they are targeting anti-government fighters holding the city.
Tribal leaders in the city confirmed the doctor's account.
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"After midnight, shelling first targeted several areas... And clashes also happened," said Mohammed Saleh, a leader of the Bijari tribe.
Mahmud al-Zobaie, a leader of the Zoba tribe, added: "There are many people killed and wounded, and many homes have been damaged because of the shelling."
Security forces have managed to wrest back control of Ramadi but a stalemate has persisted in Fallujah, just a short drive from Baghdad.
Attacks elsewhere in Iraq killed 15 others, security and medical officials said.
North of the capital in Ishaqi, four policemen were killed and four others were wounded when they tried to investigate a parked car that had a booby-trapped corpse inside.
When they opened the car door, the explosives-rigged body exploded, two police officers said.