Several mosques have been hit in a series of explosions in the Yemeni capital, Sanaa, causing dozens of casualties, officials say, according to BBC News.

At least two blasts were caused by car bombs. Health and security officials said more than 20 people had died.

A building reportedly used as the headquarters of Houthi rebel officials was also hit.

The Islamic State (IS) militant group, which has carried out attacks in Sanaa before, said it was behind the blasts.

In a statement posted online, IS said that four car bombs targeted two areas of worship, as well as a house and an office belonging to what it called "Houthi apostates", referring to the Shia Houthi rebels.

In March, IS attacks on mosques used mainly by Houthis left more than 130 people dead.