Insurgents have attacked Iraqi police posts in Sunni Muslim strongholds north of Baghdad, reportedly killing at least 30 police and national guardsmen.
A car bombing in Samarra hit civilians and police
In one of the apparently co-ordinated strikes, a police station in Dijla, south of Tikrit, was stormed by gunmen who executed 12 officers.
There were at least four other deadly ambushes around Tikrit, US forces said.
US-backed Iraqi security forces have lost hundreds of men in attacks by rebels opposed to US troops in Iraq.
Other killings included:
Three policemen shot dead at a checkpoint outside Tikrit
- Four police and one national guardsman shot dead at a police station in Ishaki, south of Samarra
- A local police commander assassinated in Baquba
- Six national guardsmen killed in a suicide bombing in Baquba
- Three national guardsmen and three civilians killed in a car bombing near a US-Iraqi convoy in Samarra
- The deputy governor of Anbar province, whose bullet-riddled body was found in Ramadi hours after his kidnapping by unknown gunmen.
In a separate incident in Baghdad, a suicide car bomber tried to kill a senior Iraqi National Guard officer as he was leaving his home.
The blast occurred in the Adhamiya neighbourhood of the capital, injuring at least eight Iraqi guards and passers-by, reports say.
Maj Gen Mudher Abud al-Mula - who was unhurt in the attack - used to be a Shia staff officer in Saddam Hussein's Sunni-dominated armed forces.
The attacks are the latest in a wave of violence intended to disrupt elections scheduled to be held at the end of January.
On Monday a car bomb targeting one of Iraq's top Shia political leaders exploded in the capital, killing at least 13 and injuring 39.
The blast occurred outside the offices of a major Shia political party, the Supreme Council for the Islamic Revolution in Iraq (Sciri), in Baghdad.