Who are the Houthi rebels and why are they attacking Red Sea ships?

Drone and rocket attacks on cargo ships in the Red Sea have led many of the world's biggest shipping companies to announce they will avoid the area. The attacks are by the Houthis - an Iran-backed rebel group which controls a large part of Yemen and began after the start of the Israel-Hamas war. In this episode, BBC security correspondent Frank Gardner joins host James Reynolds to look at why the Houthis attacked the ships, who backs them and what it means for protection in the region.

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This episode was made by Alice Aylett Roberts and Beth Timmins. The technical producers were Matt Hewitt and Ricardo McCarthy. The assistant editor is Sergi Forcada Freixas and the senior news editor is Jonathan Aspinwall.