Who are the Houthi rebels behind attacks on ships in Red Sea?

The group emerged in the 1990s and its supporters mainly come from the ranks of Zaidi Shia Muslims and the Houthi tribe.

An RAF Typhoon aircraft (Sgt Lee Goddard/MOD/Crown Copyright)

Tensions in the Middle East have risen after Iranian-backed Houthi rebels began striking at ships passing through the Red Sea.

On Monday evening, the UK and US struck multiple sites used by the rebel group for the second time this month.