Iran live updates: Iran-backed Houthis blamed for Saudi airport strike that killed 12, including American

Secretary of State Marco Rubio, in a statement posted on X, confirmed that an American citizen was killed in the strike on King Khalid International Airport in Saudi Arabia on Saturday.

Rubio said the United States "strongly condemns the recent attacks on the Kingdom of Saudi Arabia by the terrorist Houthis."

"These reprehensible attacks demonstrate a blatant disregard for innocent civilian life. They must stop now," he said. "We stand with the Kingdom of Saudi Arabia and its people and extend our condolences to the victims and their families."

-ABC News' Lauren Minore

Saudi military spokesmanTurki Al-Maliki blamed Saturday's deadly attack on King Khalid International Airport in Riyadh on the Iran-backed Houthis, according to a statement posted to social media.

Houthis were also blamed for attacks earlier this week at the airport that killed three Saudis, including a pilot.

A dozen people were killed Saturday during a "brutal" attack at the King Khalid International Airport in Riyadh, the Saudi General Authority of Civil Aviation said.

At least one of those killed was an American citizen, the agency said. The U.S. State Department didn't immediately return messages for comment.

The other slain victims included two Bangladeshi citizens, one Egyptian, one Jordanian, one Syrian, one Palestinian, and one Sudanese citizen, according to the Saudi agency.

At least 300 people were injured, the agency said.

The agency said the airport suffered "material damage, the extent of which is currently being assessed," the agency said.

There has so far been no claim of responsibility or comment from Yemen's Houthi rebels. The Iran-backed group claimed attacks on the airport earlier in the week which left three Saudi nationals dead. 

-ABC News' Jamie Dorrington

Iran's Islamic Revolutionary Guard Corps Navy said in a statement on Friday that "a giant ship" carrying LPG, which had intended to pass south of the Strait of Hormuz earlier in the day, was targeted and caught fire.

The statement said that the ship is named NV Sunshine and belongs to Nhat Viet Corporation, adding that it suffered "an extensive fire in the engine room and propulsion system."

The IRGC Navy warned that companies "deceived" by the U.S. would be sanctioned and that "necessary punitive measures will be applied to all vessels of violating companies."

"Henceforth, action against offending vessels will not be limited to the Strait of Hormuz; any vessel traversing an unauthorized route anywhere in the region will be pursued, and punishment will be inevitable," the statement added.