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       Britain’s Heathrow Airport said it would be closed all of Friday after a huge fire at a nearby electrical substation wiped out power, disrupting flight schedules around the world.

       The London Fire Brigade said around 70 firefighters were tackling the blaze in the west of London, which caused a mass power outage at Heathrow, Europe’s busiest and the world’s fifth-busiest airport.

       Huge orange flames and smoke could be seen shooting into the sky. Around 150 people were evacuated from nearby buildings and thousands of properties were without power.

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       This picture has been released by the London Fire Brigade on March 21, 2025 shows the fire which wiped out power and closed Heathrow Airport, rises at the North Hyde Electricity Substation in Hayes, Britain – Photo courtesy London Fire Brigade via Reuters.

       The fire brigade said the cause of the fire was not known.

       “To maintain the safety of our passengers and colleagues, Heathrow will be closed until 11:59 pm on 21 March,” Heathrow Airport said in a post on X, adding that passengers were advised not to travel to the airport.

       According to flight tracking website FlightRadar24, at least 120 inbound flights to Heathrow were having to divert to other airports.

       It said at least 1,351 flights to and from Heathrow would be affected on Friday, not including flights that might be cancelled or delayed due to aircraft being out of position.

       UK’s Heathrow airport shuts amid outage, throwing global travel into chaos

       British Airways itself had 341 flights scheduled to land at Heathrow on Friday.

       “Heathrow is one of the major hubs of the world,” said Ian Petchenik, spokesman for FlightRadar24. “This is going to disrupt airlines’ operations around the world.”

       The impact was immediate. Qantas Airways sent its flight from Perth to Paris, a United Airlines New York flight headed to Shannon, Ireland and a United Airlines flight from San Francisco was due to land in Washington, D.C. rather than London.

       Some flights from the U.S. were turning around mid-air and returning to their point of departure.

       Chaotic days ahead

       Travel experts said the disruption would extend far beyond Heathrow Airlines’ carefully choreographed networks depend on airplanes and crews being in specific locations at specific times. Dozens of air carriers will have to hurriedly reconfigure their networks to move planes and crews around.

       “The other question is, ‘What will airlines do to deal with the backlog of passengers?’”, said travel industry analyst Henry Harteveldt with Atmosphere Research Group.

       “It’s going to be a chaotic couple of days.” A Heathrow spokesperson told Reuters in an email that there was no clarity on when power would be restored, and they expected significant disruption over the coming days.

       Smoke rises from a fire at the North Hyde Electricity Substation, which wiped out power and closed Heathrow Airport, in Hayes, Britain, March 21, 2025 – Will Russell/Reuters.

       On the ground in London, a number of homes and businesses were without power. “Firefighters have led 29 people to safety from neighbouring properties, and as a precaution, a 200-metre cordon has been established, with around 150 people evacuated,” the fire brigade said.