At least 12 people were killed and 309 wounded in an attack on King Khalid International Airport in Riyadh on Saturday, Saudi authorities said, marking a significant escalation in hostilities between Saudi Arabia and Yemen's Houthi movement.
The Saudi General Authority of Civil Aviation confirmed that the dead included four Saudis, two Bangladeshis and nationals of the United States, Jordan, Palestine, Syria, Sudan and Egypt.
Several wounded people remained in critical condition as airport operations were suspended and damage assessments continued.
Saturday's attack was the third targeting Riyadh's international airport this week, following Thursday's Houthi strikes that killed three Saudi citizens and damaged an aircraft.
Earlier attacks on Saudi airports had also caused civilian casualties, reflecting the widening scope of cross-border hostilities.
The Saudi-led coalition reported that a separate projectile landed near King Fahd International Airport in Dammam on Saturday.
Coalition spokesman Major-General Turki al-Malki condemned the Riyadh attack as a war crime and pledged a decisive response.
The Houthis, who previously claimed responsibility for Thursday's strikes, have declared most Saudi airspace a military operations zone, warning aircraft against entering it.
The group says its attacks are retaliation for Saudi military operations supporting Yemen's internationally recognised government.
The escalating violence follows renewed fighting in Yemen, where Saudi-backed government forces are confronting the Iran-backed Houthis.
Saudi Arabia has conducted extensive air strikes against Houthi-controlled territory, including Sanaa, while fighting has intensified around strategically important Red Sea areas.
United Nations Secretary-General António Guterres condemned the airport attacks and called for their immediate cessation.
Qatar, Kuwait, Egypt and other regional governments also condemned the violence.
US President Donald Trump said Washington was considering whether to join military operations against the Houthis.
Western embassies urged citizens to avoid Riyadh airport, while several Gulf airlines cancelled flights.
Schools in Riyadh also shifted to remote learning amid heightened security concerns.
The latest attacks underscore the deterioration of the informal truce established in 2022 and growing concerns over regional stability.