London's Heathrow Airport shuts down after fire triggers outage

Heathrow Airport in London experienced a significant power outage Thursday due to a fire at an electrical substation supplying the airport, according to its X account. The post said, "To maintain the safety of our passengers and colleagues, Heathrow will be closed until 23h59 on 21 March," adding that "Passengers are advised not to travel to the airport and should contact their airline for further information. We apologise for the inconvenience." Heathrow Airport is among the busiest airports in the world.