Saudi Arabia is investigating how its air-defence systems failed to stop a barrage of missiles and drones during a series of attacks on Riyadh, while separate reporting has raised questions about why public warning alerts were absent before the strikes.

The Associated Press reported that Saudi authorities opened an investigation after attacks linked by the Houthi movement to Riyadh’s King Khalid International Airport. The Houthis claimed they had targeted the airport, but that claim has not been independently confirmed.

Reuters reported on Tuesday that Saudi Arabia had stopped issuing public warnings of imminent military attacks days before four attacks in Riyadh during the previous week. The government had not explained why the alerts were absent, according to the report.

The distinction between an air-defence failure and a public-alert failure is important. Interception systems are intended to stop or reduce the physical threat, while public warnings give residents and visitors time to seek shelter or avoid exposed areas. A breakdown in one system does not automatically establish a breakdown in the other, but the combination has created a wider question about the kingdom’s readiness.

The casualty figures have also developed as more information has emerged. Reuters reported at least 18 deaths and more than 300 injuries. AP earlier cited at least 13 people killed and more than 300 wounded. The figures should therefore be treated as reported totals under review rather than as a final consolidated toll.

The attacks come as Saudi Arabia faces a widening security crisis linked to its war with Yemen’s Iran-aligned Houthis. The rebels have warned international airlines about Saudi airports, while Riyadh has sought to reassure the public and preserve the appearance of normal commercial activity.

That tension is now difficult to contain. Airports are both military and civilian spaces: they are strategic targets, but they are also workplaces, transport hubs and gateways used by passengers who cannot assess the threat for themselves. A warning system that goes silent may protect an image of normality in the short term while making the consequences of a successful strike more severe.

The investigation will need to establish what was detected, what was intercepted, what warning options were available and why the public was not alerted. Until those questions are answered, the attacks leave not only a casualty count but a record of institutional uncertainty.