Yemen’s Houthi rebels launched multiple drones and a missile at three commercial ships being escorted in the Gulf of Aden by U.S. Navy ships, a U.S. official said Tuesday. The three U.S. affiliated flagged ships were sailing east toward Djibouti.

A military spokesman for the Houthis said earlier on Tuesday that the group had targeted three supply ships and two American destroyers accompanying them in the Gulf of Aden.