A drone boat packed with explosives has detonated in the Red Sea.
The US navy says the vessel belonged to Houthi rebels, and no damage or casualties have been reported since the blast.
Houthis, who control much of Yemen and are aligned with Iran, have launched multiple attacks on commercial vessels in the Red Sea since November.
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The group say the attacks are a protest against Israel\’s military operations in Gaza.
International shipping has been severely disrupted as a result, with multiple companies suspending journeys through the Red Sea and taking a long diversion around Africa.
Vice Admiral Brad Cooper, who leads US naval forces in the Middle East, said the latest explosion happened in dense shipping lanes.
“It came within a couple of miles of ships operating in the area – merchant ships and US navy ships – and we all watched as it exploded,” he told reporters.
The attack happened a day after 12 countries – including the US and UK – warned the Houthis of “consequences” unless it stopped targeting commercial vessels.
Read more:
UK ‘considering airstrikes on Houthis’
How the Red Sea became a battleground – and what it means for UK shoppers
Why are Houthis attacking ships in the Red Sea?