Security officials say the attack occurred at a Shi'ite mosque in the town of Khalis, about 80 kilometers north of the capital.
Around a dozen people were wounded in the explosion, which went off just after Friday Prayers.
(AFP, AP, Reuters)
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SUNNI, SHI'A: Iraq is riven along sectarian lines, faults that frequently produce violent clashes and are a constant source of tension. Sectarian concerns drive much of Iraqi politics and are the main threat to the country's fragile security environment.