The Liberia-flagged, Greek-operated bulk carrier Eternity C has sunk after a Houthi attack off Yemen, four maritime security sources told Reuters on Wednesday, and efforts to rescue the crew were under way.

Ten people have been rescued from the Red Sea after their ship sank near Yemen following an attack by the Houthis, according to the European Union’s maritime security mission, with several others believed to be being held by the rebel group.