US and UK forces have carried out air strikes against Houthi rebel targets in Yemen.
President Biden says the strikes are in response to attacks by the Iranian-backed Houthis on ships in the Red Sea since November.
UK Prime Minister Rishi Sunak added that the strikes are "limited, necessary and proportionate action in self-defence".
Strikes are reported in the capital Sanaa, the Houthi Red Sea port of Hudaydah, Dhamar and north-western Houthi stronghold of Saada.
The Houthis control much of Yemen and say they are supporting ally Hamas by targeting shipping headed to Israel.
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