While the crew of 24 has been safely evacuated, the cargo of fertilizer “could spill into the Red Sea and worsen this environmental disaster,” it said.

The attack has heightened concerns for the Red Sea’s unique coral reefs, which scientists have found to be so far resilient to climate change but at risk from other threats.

“The Houthis continue to demonstrate disregard for the regional impact of their indiscriminate attacks, threatening the fishing industry, coastal communities, and imports of food supplies,” according to the statement.

While the Rubymar dropped anchor after the missile hit, its operator, Athens’ Blue Fleet Group, says the vessel is partly submerged and its engine room is flooded. Recovery operations have begun to tow the stricken ship to the nearby port of either Djibouti or Aden.

In a second statement, U.S. Central Command said it had destroyed seven Houthi mobile anti-ship missiles “in self-defense” before they were launched.

A coalition of American and British naval vessels and warplanes has been carrying out strikes against the Iran-backed group’s military depots and launch sites in a bid to prevent further disruption to the commercially vital waterway.