Two houses were blown up on Friday in south of Baghdad, killing five people, including three children, and wounding four other people, Iraqi police said.
The pre-dawn attacks occurred within four hours of each other in Qariya al-Asriya near Iskandiriya, a city considered an al-Qaeda stronghold before the militants were pushed out by Iraqi and American forces in 2008.
Police said that among those killed were a man, a woman and three children - one of them a one-year-old- and the wounded included a woman, a young man, and two children.
The houses, which belonged to Shiite Muslim families, were blown up using dynamite, with the first attack occurring at 1:00 am (2200 GMT Thursday) and the second at 5:00 am, according to police.
Also today, gunmen killed two policemen and burned their vehicle in an ambush in the city of Samarra, north of the Iraqi capital, police said.
"Two members of the federal police were carrying out a patrol in the Qadissiya area when they were stopped and killed by unknown assailants carrying automatic weapons," said a police official, on condition of anonymity.
The attackers "then burned the (police) vehicle with the driver still inside and the other outside. They managed to escape," the official said.
The same day, four members of the Sahwa militia which opposes al-Qaeda, including a leader, were wounded by a bomb while driving in Al-Muqdadiya, northeast of Baghdad, police said.