Four civilians were killed Sunday when unknown gunmen attacked a residential area in the city of al-Hilah, some 100 kilometres south of the Iraqi capital Baghdad, security sources said, dpa reported.
Three women and one man died in the attacks, the sources said.
No one has claimed responsibility.
On Saturday, five policemen were killed when gunmen attacked a checkpoint in the city of Ramadi, around 110 kilometres west of Baghdad.
Violence in Iraq had declined after Sunni-Shiite bloodshed peaked in 2006.
But in recent months, attacks targeting security personnel have again become an almost daily occurrence.