A bomb blast killed seven people at a Shi’ite Muslim mosque in eastern Baghdad on Friday and wounded more than 20.
The explosion took place in the Baladiyat neighborhood.
A senior police source said that either a suicide belt or improvised explosive device had been used in the attack, for which there was no immediate claim of responsibility.
It was a rare attack on a Shi’ite place of worship in the Iraqi capital.
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Sunni extremists carried out high-profile bombings of Iraqi Shi’ite sites during the worst of the country’s sectarian violence after the U.S. invasion that toppled dictator Saddam Hussein in 2003.