At least 28 people have been killed and 50 wounded after two suicide bombers attacked a Shiite mosque in the Yemeni capital of Sanaa, local medics said.

Witnesses said the bombings, carried out by a man wearing an explosive belt and another driving a bomb-laden vehicle, targeted worshippers leaving the mosque in the Jarraf district in northern Sanaa.

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Islamic State’s Yemen branch have since claimed responsibility for the attacks in a statement on Twitter.

A spokesman from the Houthi-controlled health ministry said the casualty toll was a preliminary figure.

A civil war in Yemen escalated in March when a coalition of Arab states, led by Saudi Arabia, intervened to roll back the hold of Iran-allied Houthi militia over much of the country and to reinstate the government from its exile in Riyadh.

The Houthis took control of the capital Sanaa a year ago.

More than 4,500 people have been killed in the Arabian Peninsula country’s conflict.