Moreover, at least 43 people, including three US servicemen, were killed in 24 hours as a spate of bomb attacks shattered Baghdad's relative calm.
In the deadliest attack on Saturday, police said 11 Iraqi construction workers were killed when gunmen attacked their minibus in an area south of Baghdad dubbed the Triangle of Death for its insurgent violence.
Another 10 people died when a blast tore through Baghdad's mainly Shia Shula district late Friday, shortly before a night-time curfew came into effect. An eight-month pregnant woman, her unborn child and husband were among the dead.
Coalition troop losses continued to mount, with one US soldier killed in a roadside bombing in Baghdad on Saturday and two marines dead in a similar attack west of the capital on Friday, the US military said.
In the second blast to strike Baghdad on Saturday, three members of an elite Iraqi commando unit known as the Wolf Brigade were killed when a suicide bomber disguised as a commando walked into their barracks.
Interior Minister Baqer Jabr Solagh told journalists that eight people had been detained in connection with the Shula blast.
He said the commando strike had been carried out by a former brigade member and that the force's chief Major General Mohammed al-Quraishi was the target.
In the third attack, four Iraqis were wounded when a suicide bomber blew up an empty fuel tanker near the Slovak embassy in the capital's central Jadriyah neighbourhood, an interior ministry official said.
The embassy could not be reached for comment.
The bullet-riddled corpses of two brothers and a cousin were found on a main road in south Baghdad after they were lured from their homes by men in police uniforms Friday night, an interior ministry official said.
Three police commandos were killed in a drive-by shooting, while a US patrol killed two insurgents after they also came under fire from a passing car.
And in the volatile area north of the capital eight people, including a Turkish truck driver, were killed, said Iraqi security sources.
One of the incidents involved the accidental killing by Iraqi forces of Sunni cleric and member of the Committee of Muslim Scholars Wissam al-Duri and his brother, said police captain Ahmed Shaker.