Fire shuts down London's Heathrow Airport, at least 1,350 flights affected

Disrupts travel for hundreds of thousands

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A large fire near London's Heathrow Airport knocked out power Friday to Europe's busiest flight hub, forcing it to shut and disrupting global travel for hundreds of thousands of passengers. Heathrow said it didn't know when power would be restored - raising the possibility that the shutdown would last longer than just the day, as previously expected.

At least 1,350 flights to and from Heathrow were affected, flight tracking service FlightRadar 24 said, and the impact was likely to last several days as passengers try to reschedule their travel and airlines work to get planes and crew to the right places.

Authorities do not know what caused the fire but so far found have no evidence it was suspicious.

Residents in west London described hearing a large explosion, followed by a fireball and clouds of smoke, when the blaze ripped through the electrical substation near the airport.

Some 120 flights were in the air when the closure was announced, with some turned around and others diverted to Gatwick Airport outside London, Charles de Gaulle Airport near Paris or Ireland's Shannon Airport, tracking services showed.

Lawrence Hayes was three-quarters of the way to London from New York when Virgin Atlantic announced they were being diverted to Glasgow.