Yemeni fighters from the Houthi movement said they will close Saudi Arabia’s coast starting Monday. Their spokesman, Yahya Saree, described it as maritime strike. Cargo vessels moving through the Red Sea near Saudi ports could face delays. U.S. warplanes persisted in attacking targets after their warning. The group took several ships. Insurers now see Red Sea routes as hazardous. Traders are waiting anxiously, watching for higher fees or diverted shipments. Saudi ports are close to the danger zone, so any slowdown matters fast.