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. Cargo vessels moving through the Red Sea near Saudi ports could face delays. U.S. warplanes persisted in attacking objectives after their warning. The group captured several ships. Insurers now see Red Sea routes as risky. Traders are holding their breath, watching for extra costs or diverted shipments. Saudi ports are close to the danger zone, so any carries swift impact.