Police officials report that at least a dozen people have been killed and many more wounded in a blast near the Iraqi city of Karbala, south of Baghdad.
The bomb was planted on a bus and detonated near a northern entrance to the city as it passed through an army checkpoint between Karbala and the town of al-Hilla.
No group has immediately claimed responsibility for the attack. Officials reported that those killed in the explosion and subsequent bus fire were all civilians.
The bombing occurred during a holy period marked by Shias between two important religious events, Ashoura and Arbaeen.
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