The attack on Riyadh's King Khalid International Airport prompted warnings to travelers, expressions of solidarity with Saudi Arabia and calls for an end to attacks on civilian infrastructure.
International condemnation of Houthi attack
European Commission President Ursula von der Leyen said Iran-backed Houthi forces are destabilizing regional transport and energy infrastructure.
“These attacks by Iran’s proxies are pushing the region into a spiral of violence,” von der Leyen said.
She described the airport strike as a dangerous escalation and called for an immediate end to attacks on civilians.
EU foreign policy chief Kaja Kallas also condemned the strike, calling it an “appalling act of terror.”
“There can be no justification for indiscriminate attacks on civilians and civilian infrastructure,” Kallas said.
UN Secretary-General António Guterres called for an immediate halt to attacks on civilians and civilian infrastructure.
“Attacks on civilians and civilian infrastructure are a violation of international law,” Guterres said.
German Foreign Minister Johann Wadephul described the strike as “a terrorist act against Saudi Arabia and civil aviation,” while British Foreign Secretary Ed Miliband urged British nationals to avoid Riyadh airport and follow Saudi authorities' instructions.
Italian Prime Minister Giorgia Meloni censured the attack and expressed solidarity with Saudi Arabia and the victims' families.
“Attacks against civilians and civilian infrastructure are unacceptable and must stop,” Meloni wrote on X.
Meloni said Italy would continue working with regional partners to promote stability and freedom of navigation.
France also condemned the attack, describing it as “heinous” and expressing its “total solidarity” with Saudi Arabia, the French Foreign Ministry said on Sunday.
France would continue supporting Saudi Arabia in defending its territory and infrastructure, including through its military assistance, the ministry said. It also called on the Houthis to immediately stop attacks and provocations destabilizing the region.
Russia also condemned the attack on Riyadh's international airport, Interfax news agency reported on Sunday.
Canadian Prime Minister Mark Carney condemned the attack and offered condolences to the families of those killed.
“There can be no justification for attacks on civilian infrastructure,” Carney said.
The Arab League and Syria also condemned the strike. Syria's Foreign Ministry said a Syrian citizen had been killed and called for international action to prevent further attacks on civilian facilities.
Pakistan reaffirmed its commitment to Saudi Arabia's security under the two countries' joint defense agreement.
“Pakistan stands in unwavering solidarity with the Kingdom of Saudi Arabia, its leadership and brotherly people,” Prime Minister Shehbaz Sharif said.
The Houthis subsequently renewed their warning to airlines, airport workers and travelers against using Saudi airports, saying Saudi Arabia bore responsibility for failed interceptions.
Iranian officials warn of further military action
Separately, Iranian officials warned against further attacks on Iran and reiterated threats over the Strait of Hormuz.
An adviser to the commander-in-chief of the Islamic Revolutionary Guards Corps said that any new attack involving missiles or aircraft would trigger a stronger Iranian response.
“Any provocation or attack with missiles or aircraft will be met with a heavier and crushing response,” Mohammad Reza Naghdi said on Sunday.
Iranian Army Deputy Coordinator Habibollah Sayyari said the military had previously struck vessels and remained prepared to do so again.
“We defended firmly and will continue to do so,” Sayyari said. “Wherever necessary, we will act to strike the enemy.”
Deputy Foreign Minister Kazem Gharibabadi said that Iran's response to any new military action would differ from its previous responses.
“Our response in the 40-day war was different from the 12-day war, and we hope our adversaries will show some rationality,” Gharibabadi said.
Gharibabadi also described the Strait of Hormuz as an Iranian waterway and said the country would use it as an instrument against its adversaries.
Lawmaker Hassan Ghashghavi said support for reviewing Iran's nuclear doctrine was growing among officials, experts and the public.
Ghashghavi also argued that Iran's control over the Strait of Hormuz was strengthening and that the waterway could not reopen until the Islamic Republic's conditions were met.
Separately, the newspaper Khorasan, which is close to Parliament Speaker Mohammad Bagher Ghalibaf, wrote that Washington and Israel had already decided to launch another war and that recent diplomatic exchanges were unlikely to alter that decision.
Nuclear dispute and maritime pressure continue
Atomic Energy Organization of Iran chief Mohammad Eslami criticized international institutions and the International Atomic Energy Agency for their response to attacks on Iranian nuclear and non-nuclear facilities.
“The silence and selective approach of international institutions and the IAEA toward direct attacks on the Islamic Republic’s nuclear and non-nuclear facilities represent an obvious and disastrous contradiction in the international system,” Eslami said.
Foreign Minister Abbas Araghchi separately maintained that US-Israeli strikes on Iranian oil and energy infrastructure had created environmental hazards, including the possible contamination of air, soil and water.
Maritime developments added another dimension to the day's security concerns.
The United Kingdom Maritime Trade Operations agency reported an encounter involving a tanker and military forces in the Gulf of Oman, hours after the US military announced that it had struck a vessel attempting to breach its naval blockade of Iran.
The agency advised vessels to remain alert as authorities examined the circumstances.
The international condemnation of the Houthi attack on Riyadh airport came alongside renewed threats from the Houthis and Iranian officials, raising concerns about further attacks on civilian infrastructure and commercial shipping across the region.