BAGHDAD, April 23 (Reuters) - At least nine people were killed on Saturday when a suicide attacker detonated a car bomb at a security checkpoint in northern Baghdad, police sources said, adding that the death toll could rise.

There was no immediate claim of responsibility for the blast which wounded a further 28 people, but Islamic State regularly carries out attacks on security forces in the capital, including one near a Shi'ite mosque on Friday that left nine dead. (Reporting by Kareem Raheem, editing by David Evans)

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