Passengers on an Air China flight from London to Beijing, which made an unscheduled landing at Nizhnevartovsk Airport in Russia’s Khanty-Mansiysk Region, have departed for Beijing, according to Flightradar data.

"It should be taking off by now," a Nizhnevartovsk Airport source told TASS.

According to Russia’s Federal Air Transport Agency (Rosaviatsiya), the passengers spent 13 hours in the Khanty-Mansiysk Region. A backup Boeing 777 aircraft owned by a Chinese airline was sent to transport them to their destination.

The preliminary reason for landing at an alternate airport in Russia was a malfunction in one of the engines, Rosaviatsiya noted. The crew issued a PAN emergency signal and requested clearance to land. There were 250 passengers and 15 crew members on board the Air China aircraft.

The press service of the Khanty-Mansiysk regional government said hot meals and drinks were provided to the passengers and that a medical team was on duty at the airport. The passengers' and crew members' conditions were assessed as satisfactory.