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Fire-induced power outage shutters London's Heathrow Airport

1 of 2 | A fire at a nearby electrical substation submerged London's Heathrow Airport in the dark on Friday, forcing the facility to close. Photo courtesy of London Fire Brigade/ X

March 21 (UPI) -- London's Heathrow Airport, one of the busiest in the world, closed on Friday due to a "significant power outage," it said. The airport said in a statement early Friday that it would be closed until 11:59 p.m. local Friday "to maintain the safety of our passengers and colleagues."

"Passengers are advised not to travel to the airport and should contact their airline for further information. We apologize for the inconvenience," it said.

Air traffic monitor Flightradar24 reported that 120 aircraft were diverted to alternate airports. The closure, it said, would affect at least 1,351 flights.

The airport, which serves more than 82 million people a year, was submerged in darkness early Friday due to a fire at an electrical substation that supplies the British transport hub.