Islamic State (IS) says it carried out suicide bombings on two mosques in the Yemeni capital, Sanaa, which killed at least 137 people.

The attacks are the first claimed by IS - a Sunni group - since it set up a branch in Yemen in November.

Both mosques were used mainly by supporters of the Zaidi Shia-led Houthi rebel movement, which controls Sanaa.

Yemen has suffered from political instability for years and Houthi rebels control nine of the 21 provinces.

Bill Hayton reports.