Saturday's attack was the deadliest in Saudi Arabia since May 2015. American and Saudi officials blame Yemen's Houthis, who have not yet spoken out about the attack.
At least 12 people died and 309 were injured in an attack on Saturday (10) at Riyadh international airport, in Saudi Arabia, according to local authorities.
Among the fatal victims were four Saudis, two people from Bangladesh and citizens of the United States, Jordan, Palestine, Syria, Sudan and Egypt, the Saudi civil aviation authority confirmed.
Operations at King Khalid International Airport were suspended following the attack, the deadliest in the kingdom since May 2015.
A military coalition led by Saudi Arabia promised to respond to the attack, which it called a "war crime" and blamed on Yemen's Houthis.
The Houthis did not comment on Saturday's attack, but said they were responsible for attacks on the same airport on Thursday, which killed three people and damaged a plane.
Three other people were killed in Houthi attacks on two different airports in Saudi Arabia on October 6 and 7.
Clashes between Yemeni government forces, backed by Saudi Arabia, and the Houthis, who are backed by Iran and control most of the country, have intensified recently.
In addition to the attacks on Riyadh airport, a projectile also fell near King Fahd International Airport in Dammam, eastern Saudi Arabia, on Saturday, the Saudi-led coalition said.
In a statement on Saturday, the Saudi civil aviation authority said some of the injured were "in critical condition" and that damage to the airport was being assessed.
More than a dozen ambulances were seen moving to the airport, a witness told Reuters news agency.
The spokesman for the Saudi-led coalition, Major General Turki al-Maliki, said the attack on one of the passenger terminals resulted in deaths and injuries among civilian passengers and airport staff.
He described the attack as a "war crime in every sense".
An eyewitness told Reuters he saw "injured people before my eyes" fleeing from gate 401 after the attack.
António Guterres, Secretary-General of the United Nations, said he was "deeply shocked" by the attacks, which he classified as a "violation of international law" that "must cease immediately".
In a statement published on Page X, Kuwait's Ministry of Foreign Affairs called the attacks a "heinous and cowardly attack." The attacks were also condemned by Egypt, Palestine and Qatar.
US Secretary of State Marco Rubio strongly condemned the recent attacks on Saudi Arabia and confirmed the death of an American citizen in the attacks.
In statements to the press, US President Donald Trump indicated that he may join the Saudis in carrying out attacks against the Houthis, a group supported by Iran.
"We have just become aware of the recent attack, so we will make a decision. We acted very quickly."
For the second time in less than a month, schools in Riyadh switched to remote learning this week.
Western embassies in Saudi Arabia have warned their citizens to stay away from Riyadh airport. The UK Foreign Office has advised British citizens to avoid the area "until the airport is secure". The US embassy has told its employees that they must request "special authorization" to use the airports in Riyadh, Jeddah and Dammam.
Several Gulf airlines said they had canceled their flights departing or arriving at the airport, with Kuwait Airways citing the "security situation" there.
The Houthis say they are targeting Saudi Arabia because of the country's support for government forces in Yemen's civil war.
The conflict escalated after the Houthis seized strategically important stretches of the Red Sea coast in a rapid offensive.
This included the port of Mokha on the Bab al-Mandab Strait, the narrowest point in the Red Sea and a bottleneck for global shipping. Yemeni pro-government forces later claimed to have "secured" control of the strait at the southern end of the Red Sea.
The Saudi-led coalition was formed in 2015 after Arab countries joined forces to prevent the Houthis from seizing power in Yemen, ousting the country's internationally recognized government.
A temporary ceasefire was negotiated in 2022 after years of airstrikes and ground fighting that resulted in the deaths of hundreds of thousands of people, triggering one of the world's worst humanitarian crises.
But the informal truce began to unravel in July.
The Houthis announced a "maritime embargo" against Saudi Arabia and began missile and drone attacks on Saudi airports, oil installations and tankers in the Red Sea.
They said they were retaliating against what they described as a years-long Saudi blockade and an airstrike on the airport in Yemen's capital Sanaa, which is controlled by the Houthis.
The Houthis are an armed political and religious group from northern Yemen that defends the country's Shiite Muslim minority, the Zaidis.
They declare themselves part of the Iranian-led "axis of resistance" against Israel, the US and the West in general, along with armed groups such as Hamas and Lebanon's Hezbollah movement.
The latest exchanges come amid fears that the US and Israel may be about to resume attacks against Iran. Efforts to secure a deal to end the conflict, which has sent shockwaves through the global economy, have so far yielded no results.
