Officials say at least four people were wounded and a curfew has been imposed.
The suicide bombing near the Shi'ite mosque in Haswah on March 24 killed at least 14 people.
Meanwhile, reports say that at least seven people were killed and five bodies found across Iraq today.
The U.S. military today gave more details about the seizure of a chlorine truck bomb on March 23 in Al-Ramadi, west of Baghdad.
They said the vehicle contained several thousand liters of chlorine and two tons of explosives. The seizure was first reported on March 23. There have been seven chlorine bomb attacks in Iraq in the past few months.
(compiled from agency reports)
The Imam Al-Mahdi Army on parade (epa)
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THE COMPLETE PICTURE: Click on the image to view RFE/RL's complete coverage of events in Iraq and that country's ongoing transition.