The civilians died in explosions at around 8:00 am (0500 GMT) in the village of Al-Khanafsa, north of the central Shiite shrine city of Karbala, a police officer said.
It was not immediately clear who was the target of the attack which also wounded three civilians, according to Jamal Abdullah, spokesman for Karbala provincial health services.
West of the main northern city of Mosul, two truck drivers were killed when gunmen opened fire on a convoy of lorries along a highway leading to the Syrian border, an Iraqi army officer said.
In the Al-Shaab neighbourhood of north Baghdad, an employee of the department of transport was assassinated by unknown attackers using guns with silencers, an interior ministry official said.
Police officer Abdulhussein Jassem was killed in similar fashion in the Qahira district of north Baghdad.
Explosions in Baghdad and the oil-rich, ethnically mixed city of Kirkuk left five people wounded, security officials told AFP.
Violence levels are dramatically lower than at the peak of Iraq`s sectarian bloodshed in 2006 and 2007, but attacks remain common. A total of 211 people were killed in violence in April, official figures showed.
(SYS/M014)
Editor: Suryanto
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