bbc:

The Islamic State (IS) group says it was behind a suicide bombing on a Shia mosque in Saudi Arabia that killed at least 21 people.

The attack in Saudi Arabia's Eastern Province is the first to be claimed by the Saudi branch of IS, which was formally established last November.

The claim was posted on Twitter with an image of the bomber by an account that is a reliable source on the group.

IS has previously threatened to attack Shia Muslims in Saudi Arabia.

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