Nine people were killed and 38 hurt in attacks across Iraq on Saturday, including four members of a government-backed Sunni militiaman's family in Baquba, security and health officials said.
The blast in Baquba, located 60 kilometres north of Baghdad and the capital of Diyala province, successfully targeted relatives of a Sahwa (Awakening) member, a police officer said, giving the toll.
Two family members were wounded in the attack, he added.
The Sahwa, known as the Sons of Iraq by US forces and comprised of former insurgents, began to ally with American troops in 2006 in an effort to combat Al-Qaeda rebels.
In other violence, three people were killed and dozens wounded when a massive parked car bomb exploded near an Iraqi army base and close to the health ministry in Baghdad.
The blast occurred next to the former site of the country's defence ministry, which is now used by the national
army, an interior ministry official said, giving the death toll.
An official at Medical City Hospital in the capital said 35 people were being treated for injuries.
In the west of the capital, meanwhile, a civilian was killed and another wounded when a homemade bomb exploded as they drove past in their car.
And in the northern city of Mosul, a traffic policeman died when a roadside bomb targeting a passing Iraqi army patrol was detonated, local police said.