DUBAI -- Yemen's Iran-backed Houthi militants hit Riyadh's airport on Saturday in a fresh missile attack on the Saudi capital's air links.
Terminal 3 of the King Khalid International Airport suffered a direct hit from missiles and has been evacuated, with at least some injuries, Saudi officials said.
Several ambulances and a few helicopters were sent to collect the wounded and take them to King Fahad hospital in Riyadh, one of the officials said. A video the official said was authentic showed blood smeared on the floor.
People near the airport said they heard multiple loud bangs and saw smoke rising from the area.
Arrivals were canceled or delayed across the board Saturday afternoon, according to flight tracker Flightradar24. One passenger on a flight to Riyadh said his plane was diverted to Dammam instead and that he was taking a taxi back to the capital.
The Riyadh airport told passengers to check their flight status with their airlines but didn't explain why.
Saudi press officials didn't immediately comment on Saturday's strikes. The civil aviation authority couldn't be reached for comment.
Canada, Germany and Ireland warned their citizens to avoid the airport in Riyadh. Canada said military activity there had disrupted flights. Ireland's embassy called it a serious incident.
The attack followed one Thursday that left three dead including a pilot for flag carrier Saudia and destroyed a passenger jet.
The long simmering conflict between Saudi Arabia and the Yemeni militant group flared into renewed war over the summer. The Houthis said this week that Saudi airspace is now part of the battlefield.
The continued missile attacks on airports in Riyadh and a number of southern Saudi cities threaten to choke off business travel and tourism just as the busy conference and travel season gets going.
A major test will come with the kingdom's flagship Future Investment Initiative summit, which is expected to draw thousands of global executives and investors to Riyadh at the end of this month. Conference officials said before the Saturday attack that safety is their top priority and that comprehensive safety measures will be in place.
Still, Saudi leaders are growing more worried that the conflict with the Iran-backed Yemeni militants will damage the economy, people familiar with the matter said. They also are concerned about tight supplies of missile interceptors needed to fend off attacks, they said.
The coming days will be crucial as business executives and travelers weigh the risks of continued strikes.
Geopolitical risk firm Dragonfly, which like The Wall Street Journal is owned by Dow Jones, said in a note to clients that the kingdom appears to be struggling to intercept the attacks, which are likely to continue.
A new State Department warning Thursday said U.S. government officials now need special authorization to use the Riyadh airport. The U.K. warned against all but essential travel to areas of Saudi Arabia including Riyadh.
Canada already had recommended airlines not enter Saudi airspace, while France issued a warning to avoid much of it. Germany has urged pilots to weigh the risks of flying, particularly south of Jeddah closer to the border with Yemen.