Yemeni fighters from the Houthi movement said they will close Saudi Arabia’s coast starting Monday. Their spokesman, Yahya Saree, dubbed it a maritime strike. Merchant ships moving through the Red Sea near Saudi ports could face delays. U.S. warplanes continued striking objectives after their warning. The group captured several ships. Insurers now see Red Sea routes as hazardous. Traders are waiting anxiously, watching for higher fees or diverted shipments. Saudi ports border the danger zone, so any carries swift impact.