A wave of bomb attacks have left at least 49 people dead in Baghdad. 

Ten cars rigged with explosives have blown up in predominantly Shia Muslim areas in and around Baghdad, while a suicide bomber has attacked soldiers queuing up for their pay in northern Iraq, according to police.

There was no immediate claim of responsibility for any of the blasts.

The deadliest attack took place in the northern city of Mosul, when a man driving a car blew himself up outside a government bank where soldiers were waiting to collect their salaries.

Twelve people were killed in the blast.

A further 37 people died in apparently co-ordinated blasts in and around Baghdad.

In the worst of those, two car bombs exploded moments apart near a busy market in the town of Nahrawan, south of the capital, killing seven.

Shia have been targeted by Sunni Muslim insurgents, including al Qaeda who have been regaining momentum this year after being forced underground in 2007.

Insurgents have exploited growing anger among Iraq's Sunni minority, who complain they have been marginalised under the Shia-led government that came to power following the US-led invasion in 2003.

Violence, which reached a climax in 2006-07 before starting to ease, is now on the rise again, with around 3,000 civilians killed so far this year, according to monitoring group Iraq Body Count.