The deadliest strike hit King Khalid International Airport, killing at least 13 people and wounding more than 300. One of the dead is a U.S. National. Two regional officials said Monday that Saudi Arabia has opened an investigation into how its air defenses missed the barrage. They spoke on condition of anonymity because they lacked authorization to comment publicly.
The early probe shows the Houthis fired multiple drones first to clear the way for a mix of cruise and ballistic missiles. The weapons flew more than 620 miles. Houthi ballistic missiles can carry warheads that change direction in flight, which challenges Patriot interceptors and other systems the Saudis use.
The airport stays shut, and the fallout is spreading. Brent crude, the international benchmark, climbed back to a two-week high above $105 a barrel Monday, after Trump said Saturday he was considering joining the Saudi offensive. Delta Air Lines delayed planned flights from Atlanta to Riyadh. Fighting also continues near the Strait of Hormuz, where the U.S. Military said Sunday it disabled a cargo vessel whose crew ignored warnings and tried to run the naval blockade of Iran's ports and vessels.

