Yemeni fighters from the Houthi movement said they will block Saudi Arabia’s coast starting Monday. Their spokesman, Yahya Saree, called it a maritime strike. Cargo vessels moving through the Red Sea near Saudi ports may encounter holdups. U.S. warplanes kept hitting objectives after their warning. The group seized several ships. Insurers now see Red Sea routes as risky. Traders are watching closely, watching for higher fees or rerouted cargo. Saudi ports sit near the threatened zone, so any delay is critical quickly.