It’s going to be a day of chaos for hundreds of thousands of travellers after an electrical substation fire forced the closure of London’s Heathrow Airport.

The airport, ranked one of the busiest in the world, is closed today after a transformer caught fire, knocking out power for tens of thousands in West London.

Flights bound for Heathrow have been forced to divert at airports throughout the world, including the airport in Goose Bay.

Since last night, several flights bound for the U.K. have landed at Goose Bay Airport, with some already en route back to airports in the United States.

Officials at Heathrow say it could be up to a week before everything is back on track.

In January alone, six million passengers filed through London Heathrow.