But a number of
in the south have raised fears that sustained violence could return to the area.
The BBC's Nicholas Witchell, in Baghdad, says that because Bathaa is in a Shia area, Sunni insurgent groups linked to al-Qaeda will inevitably be suspected of being behind the blast.
plans to withdraw its troops
from Iraqi cities and major towns by 30 June, and is due to end combat operations across Iraq by September 2010, leaving Iraqi security forces to cope alone.
There are concerns that insurgents may try to take advantage of the withdrawal, although the country's leaders say Iraqi forces are capable of handling internal security without US support, says our correspondent.
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