The blast, which occurred in the early morning, also badly damaged a neighbouring home in Iskandiriyah, which lies within a confessionally mixed area known as the Triangle of Death because of frequent attacks since the 2003 US-led invasion.
Mohammed al-Shammari, a doctor at the main hospital in the nearby city of Hilla, said six people were killed and 11 others were wounded in the explosion.
Among the injured were women and children, he said. The wounded included four who were badly hurt.
A police lieutenant in Iskandiriyah also put the toll at six dead, including two children, and six wounded.
The family whose house was bombed were members of the Shiite Al-Massudi tribe, he said.
Two separate attacks south of the disputed northern oil city of Kirkuk, meanwhile, left one anti-Qaeda militiaman dead and two people wounded, local police said.
And in the restive central province of Diyala, an Iraqi soldier was gunned down in front of his home in the town of Khales, and two people were wounded by a roadside bomb in the provincial capital Baquba, an army officer said.
Violence in Iraq has declined from its peak in 2006 and 2007 but attacks remain common. A total of 259 Iraqis were killed in attacks in July, the second-highest monthly figure for 2011. (S008/A011/K004)
Editor: Kunto Wibisono
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