CAIRO: A bomb exploded at a Shia Houthi mosque in the Yemeni capital Sanaa on Friday, wounding 13 people, a security source said, and the Islamic State claimed responsibility for the attack in a statement on Twitter.

“Members of the caliphate in Sanaa have detonated an explosive device in a Houthi mosque in the people's district ... which lead to the death and injury of many of them ” said the Islamic State.

According to a security source in Sanaa two out of the 13 wounded were in critical condition. The source added that the bomb was planted inside the mosque before Friday prayers.

The bombing came against a backdrop of civil war in the country.

Houthi rebels have seized large swathes of territory, including Sanaa, prompting formation of a Saudi-backed Arab coalition that is using air power to try to halt their advances.

Militants have been seeking to extend their influence amid the chaos.

Earlier this year, a group of Islamist fighters in Yemen renounced their loyalty to Al Qaeda's leader and pledged allegiance to the head of the Islamic State.

Al Qaeda in the Arabian Peninsula (AQAP), Al Qaeda's Yemeni wing, has killed hundreds in attacks across the country in recent years and has taken advantage of fighting in recent months to consolidate its hold in eastern regions.

A Shia mosque in Saudi Arabia's Shia-majority Qatif region was the target of a suicide bombing today during Friday prayers. The attack killed at least four, according to eyewitnesses.

Read more: Suicide bomber strikes at Shia mosque in S. Arabia, several casualties: residents