BAGHDAD, April 22 (Reuters) - A suicide bomber killed at least nine people when he detonated an explosive vest after Friday prayers at a Shi'ite Muslim mosque in southwestern Baghdad, police and hospital sources said.

There was no immediate claim of responsibility for the blast in al-Radwaniya district, which wounded at least 25 others, but Islamic State militants battling government forces in the north and west have regularly targeted Shi'ite areas in the capital.

(Reporting by Kareem Raheem; Writing by Stephen Kalin; Editing by Larry King)

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