A suicide bomb attack on a mosque in Yemen's capital Sanaa has left at least 25 people dead and wounded at least 36.

The Islamic State (IS) militant group has claimed responsibility for the attack.

Two explosions struck the al-Balili mosque as worshippers were performing prayers for the Eid al-Adha festival.

The attack comes two days after Yemen's President Abdrabbuh Mansour Hadi returned to the southern city of Aden from exile in Saudi Arabia.

He had fled in March following gains by Houthi rebels, who have since been targeted by a Saudi-led coalition.

The coalition, along with loyalist forces, has pushed back the Houthis from some areas, including Aden.

However the Houthis - Shia Muslim rebels from the north of the country - still control the capital.

The UN says almost 4,900 people, including more than 2,200 civilians, have been killed in Yemen in fighting on the ground and air strikes since 26 March.