A massive fire that broke out at a substation supplying power to Heathrow Airport caused a widespread power outage, leading to the closure of Europe’s largest airport throughout Friday, resulting in unprecedented disruptions in air traffic in London.

Heathrow Airport Holdings reported that the fire erupted at an electrical station on Nestles Road in the Hayes area, partially disrupting the airport’s electrical infrastructure.

London fire authorities announced they had brought the fire under control, which affected thousands of local homes and businesses and disrupted thousands of flights.