Global supply chains could face severe disruption as a result of the world's biggest shipping companies diverting journeys away from the Red Sea.
Attacks by Houthi rebels in Yemen on commercial vessels in recent weeks have resulted in many firms deciding to avoid one of the world's busiest shipping lanes.
The Houthi group has declared its support for Hamas and has said it is targeting ships travelling to Israel.
But who are the Houthis? What are their motivations? And what are their links to Iran? The BBC’s analysis editor Ros Atkins explains.
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