WASHINGTON (AP) — The United States and 12 allies issued what amounted to a final warning to Houthi rebels on Wednesday to cease their attacks on vessels in the Red Sea or face potential targeted military action.

The Yemen-based militants have carried out at least 23 attacks in response to the Israel-Hamas war in Gaza since Dec. 19.

A senior Biden administration official declined to detail rules of possible engagement if the attacks continue, but underscored that the Iranian-backed Houthis should “not anticipate another warning” from the U.S. and its allies.