The explosion took place Saturday afternoon when a bomber struck a bus carrying Shia pilgrims outside Samarra, 110 km north of Baghdad, a provincial police source said, Xinhua reported.
The attack comes two days after a similar incident killed nine people in the same area.
An explosives-laden vehicle went off near worshippers in the small Shia town of Dujail in Salahudin Province on Thursday killing nine people and wounding 43 others.
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