A spate of blasts in Baghdad killed at least 21 people on Thursday, officials said, as Iraq grapples with a political row that has stoked sectarian tensions.

The violence, which left dozens more wounded, was the worst since a series of explosions across the Iraqi capital on December 22 killed 60 people, shortly after the crisis erupted and following the withdrawal of US troops from the country barely two weeks ago.

In the north Baghdad neighbourhood of Kadhimiyah, twin car bombs exploded at around 9:00 am (0600 GMT), at intersections near to each other, officials from the interior and defence ministries said.

The blasts killed 12 people and wounded 22 others, the defence official said, while the interior ministry source put the toll at 15 dead and 31 wounded. Both spoke on condition of anonymity.

And in Sadr City, district in the north of the capital, a booby-trapped motorcycle exploded at around 7:00 am (0400 GMT) near a group of day labourers waiting to pick up work, killing seven and wounding 20 others, the interior ministry official said.

A short time later, twin roadside bombs detonated near the district's main hospital as victims were being ferried in, killing two more people and wounding 15, the official said.

The defence ministry official also put the combined toll from the Sadr City attacks at nine dead and 35 wounded.(