Police said a bomb exploded near a house in a suburb southeast of Baghdad, then a second bomb went off as people gathered at the site of the blast.
About 20 people were reported injured.
Violence in Iraq has declined significantly since its peak in 2006 and 2007, but attacks remain frequent.
More than 180 people have been reported killed in attacks in the country in the past two weeks.
Reports say most of the recent attacks have targeted members of the majority Shi'ite Muslim community, amid feuding between Iraq's Shi'ite, Sunni, and Kurdish political factions.