The Houthi movement, also known as Ansar Allah, is an Islamist rebel movement fighting in the Yemen Civil War.
They are primarily made up of Shia Muslims and their name comes from their leadership being primarily from the Houthi tribe.
Widely believed to be an Iran-backed proxy group, the Houthis are also known for their antisemitic views. Their slogan is "God is the Greatest. Death to America. Death to Israel. A Curse Upon the Jews. Victory to Islam."
Iran-backed Houthis have increased their attacks and made several claims of targeting numerous ships in recent days, including claims, without evidence, that they were targeting Israel-linked ships.
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In March, the group's leader said the group was expanding its attack area to prevent Israel-linked ships from passing through the Indian Ocean toward the Cape of Good Hope.
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Ambrey and UKMTO received a report of the incident 54 nautical miles northwest of Yemen's Mokha.
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The attack on the Andromeda Star comes after a brief pause in the Houthis' campaign that targets ships with ties to Israel, the United States and Britain.
The tanker, which was not identified by name, was en route from Pimorsk, Russia, to Vadinar, India, when it was attacked, Ambrey said in its advisory note.
Houthi attacks have disrupted global shipping through the Suez Canal, forcing firms to re-route to longer and more expensive journeys around southern Africa.
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