In this old photo, destroyed cars sit at the site of a blast in Baghdad on May 30, 2013. PHOTO: AFP
In all, seven vehicles rigged with explosives went off in five cities south of Baghdad during morning rush hour, leaving 56 people wounded in primarily Shia areas of Iraq.
No group immediately claimed responsibility for the attacks, but Sunni militant groups linked to al Qaeda frequently target Shias, whom they regard as apostates, in coordinated attacks.
Car bombs went off in Kut, Aziziyah, Mahmudiyah, Nasiriyah and Basra, officials said.
In Kut, provincial capital of Wasit and 160 kilometres south of Baghdad, a car bomb exploded outside a restaurant in an industrial area packed with vehicle repair garages, killing seven people and wounding 15.
Another car bomb in nearby Aziziyah in the town's main marketplace and near a Shia mosque killed five and wounded 10.
Twin blasts in the southern port city of Basra, meanwhile, killed five people, including a bomb disposal expert looking to defuse one of the rigged vehicles.
Three others were killed in bombings in Nasiriyah and Mahmudiyah.
The violence was the latest in a spike in attacks nationwide, with last month registering the highest death toll since 2008, sparking fears of a return to the all-out sectarian war that blighted Iraq in 2006 and 2007.
There has been a heightened level of unrest since the beginning of the year, coinciding with rising discontent among the Sunni Arab minority that erupted into protests in late December.
Analysts say a lack of effort by the Shia-led authorities to address the underlying causes of the demonstrations has given militant groups fuel and room to manoeuvre to carry out their activities.
The outgoing UN envoy to Iraq Martin Kobler has warned the violence is "ready to explode".
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