The official said he had raised concerns about Heathrow’s electricity supply days before a power outage forced it to shut down. Heathrow disputed the relevance of the official’s comments.

London Heathrow Airport was warned about possible issues with its power supplies a few days before a nearby fire cut electricity to the hub and forced Europe’s busiest airport into an unprecedented day-long blackout.

At least 1,350 flights to and from Heathrow were affected already, including several from US cities that were canceled, flight tracking service FlightRadar 24 said.

Heathrow Airport was warned about the "resilience" of its power supply in the days before a fire which shut down the airport for more than a day last month. The boss of a group representing airlines told a group of MPs on Wednesday that he spoke to Heathrow on 15 March about his concerns and again on 19 March.

London Heathrow Airport was warned about possible issues with its power supplies a few days before a nearby fire cut electricity to the hub and forced Europe’s busiest airport into an unprecedented day-long blackout.

Heathrow Airport was warned about risks to its power supply days before it closed following a major fire. Nigel Wicking, chief executive of Heathrow Airline Operators Committee, which represents airlines that use the London airport,