Saudi Arabia extended on Monday the closure of the international airport in Riyadh after announcing the Saudi-led coalition was responding to Houthi combined drone and missile attacks. On Saturday, another attack left 13 dead and over 300 injured. This is one of the worst disruptions to Saudi aviation in years – marking a significant escalation in the war with Yemen’s Houthi rebels. Details and analysis by FRANCE 24 international affairs editor Philip Turle.