Sanaa: A double suicide bombing killed at least 10 people on Thursday at a mosque run by Yemen's Houthi group in the capital Sanaa, where worshippers were performing Muslim Eid al-Adha prayers, medics and witnesses said.

Islamic State's branch in Yemen claimed responsibility for the attack at al-Balili mosque, just outside the Old City of Sanaa, saying that dozens of "rejectionists" were killed or wounded. The Sunni militant group uses that term to describe Shi'ite Muslims it seems as heretics.

Medics said at least 36 other people were wounded. A Houthi website gave a death toll of at least 10, while Arab media said it was at least 25.

The Houthis, allies of Iran, seized Sanaa a year ago and forced President Abd-Rabbu Mansour Hadi into exile in Saudi Arabia. Since March, the Western-allied Saudis have led an Arab coalition trying to restore Hadi to power and drive the Houthis back to their northern stronghold.

More than 4,500 people have been killed in the conflict, which Islamic State has exploited to expand its operations.

Witnesses described a twin suicide attack on the mosque, where worshippers were celebrating Eid al-Adha, the feast of sacrifice.

Nayef, who lives nearby, said he heard one explosion followed quickly by a second. "We gathered to rescue the wounded. The situation is very painful and blood is everywhere."

The witnesses said the first blast shook the mosque soon after worshippers gathered for prayers. A second suicide bomber detonated his explosives belt when Houthi guards tried to stop him rushing deep inside the mosque.

"We rushed outside and summoned the ambulances," one witness said.

Houthi fighters sealed off the area and shouted at onlookers to stay away.

It was the second attack in the capital this month to target a mosque run by the Shi'ite Zaydi group. On Sept. 2, at least 28 people were killed and 75 wounded in twin suicide bombings claimed by Islamic State at a mosque in northern Sanaa.

In March, Islamic State suicide bombers killed at least 137 worshippers and wounded hundreds more in coordinated attacks at two mosques during Friday prayers in Sanaa.