Houthi attacks on Saudi Arabia’s King Khalid International Airport in Riyadh killed 13 people and injured more than 300 on Oct. 10, although initial reporting listed 12 deaths and 309 injuries, including one American. A further projectile struck the airport on Oct. 11, the fourth attack in a week, while the facility remained closed through at least 5 p.m. EDT Monday. The Federal Aviation Administration warned U.S. airlines and operators of U.S.-registered aircraft about military activity and navigation-system interference through Dec. 10, including risks during overflight, arrivals and departures. President Donald Trump said U.S. participation in airstrikes was possible, but Sen. Chris Murphy, Democrat of Connecticut, opposed retaliation and argued that expanding American involvement would increase regional danger. The attacks disrupted flights, businesses and energy events, intensified Saudi Arabia’s security and economic pressures, and threatened wider shipping and energy disruption.