The Houthis provided no evidence for the attack, and Saudi Arabia did not immediately issue a statement. However, witnesses reported hearing explosions in Riyadh, including a large blast at King Khalid International Airport. One witness told the Associated Press that fire and ambulance crews were deployed, and a video verified by Reuters showed a thick column of black smoke and flames rising from the airport. The witness said outgoing flights were halted and passengers were instructed to evacuate.
Lufthansa and Air India confirmed they were suspending flights to Riyadh. According to aviation data firm Cirium, almost half of departures from the airport had been cancelled by 1500 GMT on Thursday, with 31 more cancellations expected for Friday across all Saudi airports. Three people briefed on the matter said no passengers were believed to have been on the damaged plane at the time, but they could not rule out injuries.
The attack comes after Saudi authorities said on Wednesday that three people had been killed this week in strikes on Riyadh airport and Abha airport in the country's southwest. The Houthis escalated their campaign on Thursday, attempting to shut down the kingdom's airspace and warning workers to stay away from energy plants, which they said would be targeted. Saudi officials reported that debris from an intercepted missile hit a kindergarten and medical complex in Riyadh.
The Houthis say they are targeting the kingdom over its support for government forces in Yemen's reignited civil war. Saudi Arabia says it is backing an offensive by Yemen's UN-recognised government to take back territory from the Houthis. The Houthis have made a lightning advance across Yemen's coastal plain over the last month, appearing to gain ground in the country's south-west as the group approached the city of Taiz. Independent observers warned the group could capture Taiz, with some signs that government-aligned forces were pulling back to secure the major port city of Aden.
Riyadh is due to host a major meeting of energy policymakers, the WPC Energy Congress, this week.