A missile hit King Khalid International Airport in the Saudi capital Riyadh on Saturday. Many people were injured and the airport was evacuated, two regional officials said. They spoke on condition of anonymity because they are not allowed to speak publicly. One of them said the missile fell directly on the passenger terminal.

Ambulances rushed to the airport, and a Riyadh resident said he heard at least two loud explosions. The Houthis in Yemen did not immediately claim the strike, but they have claimed earlier attacks on the airport. Saudi authorities did not immediately respond to a request for comment.

The last plane landed at the airport at 14:05, and for nearly four hours flights to Riyadh were diverted to other airports. A flight-tracking service shows at least 225 flights were cancelled over the previous 24 hours. Kuwait Airways cancelled flights because the airport closed. Air India, FlyDubai, Lufthansa Group and Pakistan International Airlines are among the carriers that stopped flights to Riyadh and other Saudi airports.

Two days earlier, another attack on the airport killed three Saudi citizens, among them a pilot, and damaged an empty passenger plane on the ground. A Sudanese national died in the attack on Wednesday.

The airport has been a target many times since a Saudi-led coalition launched a major offensive last week against the Iran-backed Houthis. The coalition is giving air support to Yemeni government forces trying to retake territory the Houthis seized along the Red Sea. The Red Sea is a key shipping route and an alternative to the Strait of Hormuz. The Houthis say their blockade targets Saudi ships.

The European Union Aviation Safety Agency (EASA) has widened its advice on the kingdom's airspace. The agency says the Houthis can hit targets deep inside Saudi Arabia, including Riyadh, and increasingly aim at airports and other aviation infrastructure. Missiles and drones, along with efforts to intercept them, pose an added risk to civilian aircraft, including misidentification, EASA says.

Saudi Arabia is seeking help from Washington and other allies. Asked on Friday about the attacks on the airport, US President Donald Trump told reporters he was "not happy" and the situation was "not good". So far there is no sign that Washington will give more military support. Officials say US help includes sharing intelligence, picking targets and operational planning for the latest offensive.

The Canadian embassy called on its citizens to stay away from the area because of the ongoing fighting. Saudi authorities warned residents not to film or share information about missile intercepts, drone attacks and impact sites, saying violations could have legal consequences.

The foreign ministers of Saudi Arabia and Oman discussed diplomatic efforts to ease tensions in the region on Saturday. The Saudi foreign ministry said the two stressed the importance of backing diplomatic solutions.