Yemeni fighters from the Houthi movement said they will seal off 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 might see postponements. U.S. warplanes continued striking objectives after their warning. The group captured several ships. Insurers now see Red Sea routes as dangerous. Traders are watching closely, watching for extra costs or diverted shipments. Saudi ports sit near the risk area, so any delay is critical quickly.