Civil aviation authorities reported early Sunday that an assault on the international airport serving Riyadh left 12 people dead and more than 300 others wounded, a number of whom were in a life-threatening condition. The Saudi-led coalition attributed responsibility for the incident to Houthi forces operating out of Yemen, which the coalition identified as receiving backing from Iran.

Among the Gulf Arab states, no armed assault had claimed as many lives, a toll that placed the episode within the broader arc of the conflict — a war whose theatres had widened to take in renewed ground fighting between Houthi forces and Yemeni government units backed by Saudi Arabia.

An unnamed regional official, barred from speaking to the press without authorisation, reported that a projectile struck the section of King Khalid International Airport where terminals 3 and 4 handle domestic travel. Among the twelve people whose deaths were confirmed, four held Saudi citizenship, while the remaining eight came from Bangladesh, Palestine, the United States, Egypt, Jordan, Syria, and Sudan — two of them Bangladeshi nationals. Those with injuries were taken to a number of hospitals for treatment.

The airport attack — part of a pattern of strikes logged across the previous week — drew attention to calls from some of Saudi Arabia's international partners, the United States among them, regarding military support for the kingdom, which has been navigating its conflict with the Houthis while working to prevent hostilities from broadening into an outright war.

In the hours following Saturday afternoon's attack, President Donald Trump indicated he was weighing whether the United States would participate in Saudi-led strikes against the armed group, noting that his administration had only just learned of the incident and that a decision had not yet been reached. He added that a ruling on the matter would be reached.

The coalition led by Saudi Arabia attributed the attack to the Houthis, describing it in a formal statement as a violation of the laws of war and pledging a measured but resolute response. No dedicated military infrastructure exists within the airport's boundaries. No statement had been issued by the armed group, which had earlier that Saturday attributed an airstrike on Sanaa International Airport to Saudi forces.

Responsibility for strikes on King Khalid International Airport earlier that week — attacks in which three people lost their lives, among them a pilot — was asserted by the Houthis. Across the seven days that followed the coalition's launch of military operations against the Houthis, attacks on Saudi territory multiplied to include airports beyond the initial targets, along with military installations and oil infrastructure.

On Saturday morning, civil aviation authorities announced that all air traffic at airports across the country had been grounded. Officers stationed at every entrance held the terminal grounds under a controlled perimeter, while lighting across the facility was reduced to a lower level. According to the Flightradar24 tracking service, aircraft were rerouted to alternative airports.

Travel advisories directed at nationals of the United States, Britain, Germany, Australia, and Canada urged those individuals to keep away from the airport. Financial markets and the broader region registered notable turbulence after strikes on Saudi Arabia, the leading exporter of crude oil, were carried out. Proceedings for a large international energy conference, scheduled to open in Riyadh on Sunday, continued to be promoted by the energy ministry in the hours following the latest attack.

For a period before the recent escalation, the Houthis had remained at the margins of the conflict involving Iran. Analysts have described the armed group as a vehicle through which Iran maintains influence over a country that holds close ties with the United States. In 2015, a coalition of forces led by Saudi Arabia entered Yemen's civil war on behalf of the internationally recognised government, drawing the kingdom into direct military confrontation with the Houthi movement.

A period of relative quiet that had followed the 2022 ceasefire broke down in July, when the Houthis launched fresh attacks, citing a Saudi strike on Sanaa airport as an aircraft from Iran attempted to land there. Renewed grievances over the blockade, led by Saudi Arabia and directed at territories under Houthi administration, were brought back to the surface by that development.

Aerial backing from the Saudi-led coalition has drawn the front lines back into contest, with Yemeni government troops pushing to reclaim territory along the Red Sea coast that Houthi fighters had taken in recent weeks. Interceptor stockpiles held by Saudi Arabia had been drawn down to low levels, according to accounts relayed through a broadcaster the previous month by area officials, who described outreach to France, Britain, Pakistan, and Egypt for air defence reinforcement — with one of those officials noting that comparable reserves on the American side had similarly been depleted through the fighting with Iran.

Intelligence sharing, target identification, and operational planning for the recent Houthi offensive were among the forms of assistance that officials described as part of the U.S. contribution. A phone call between the foreign ministers of Saudi Arabia and Oman on Saturday centred on the value of pursuing diplomatic avenues to ease regional tensions, according to a statement from Riyadh. Positioned on the opposite shore of the Strait of Hormuz from Iran, Oman has on various occasions served as an intermediary for parties in the region.

A notice distributed by the Houthis in recent days informed commercial carriers worldwide that Saudi airspace falls within the boundaries of a zone the group has designated for its own military operations. Four carriers — Air India, FlyDubai, the Lufthansa Group, and Pakistan International Airlines — suspended their services into and out of Riyadh and other Saudi airports, each halting operations for its own set timeframe. Updated guidance from the European Union Aviation Safety Agency reflected an assessment that Houthi forces had demonstrated the reach to strike targets well into Saudi territory — Riyadh among them — along with a sharpened focus on aviation infrastructure as a potential point of attack.