The U.S. military carried out new strikes in Yemen on Tuesday against anti-ship ballistic missiles in a Houthi-controlled part of the country as a missile struck a Greek-owned vessel in the Red Sea.

Attacks by the Iran-allied Houthi militia on ships in the region since November have affected companies and alarmed major powers — an escalation of Israel's more than three-month-old war with Palestinian Hamas militants in Gaza. The Houthis say they are acting in solidarity with Palestinians and have threatened to expand attacks to include U.S. ships in response to American and British strikes on their sites in Yemen.

In a bid to cut off their funding and supply of weapons, U.S. President Joe Biden's administration plans to put Houthi rebels back on a U.S. list of terrorist organizations, two U.S. officials have said.