One of the world’s busiest airports is shut down for the entire day after a fire triggered a power outage.
London Heathrow Airport said a fire at an electrical substation cut off power.
"To maintain the safety of our passengers and colleagues, Heathrow will be closed until 23h59 on 21 March," the airport posted on X.
On Friday alone, Heathrow expected up to 291,000 passengers on 1,351 flights, according to Reuters.
Passengers were told to stay away and check with their airlines for updates.
"We apologise for the inconvenience," Heathrow Airport wrote.
Airlines quickly began releasing statements to address the chaos.
British Airways said the situation "will clearly have a significant impact on our operation and our customers and we're working as quickly as possible to update them on their travel options for the next 24 hours and beyond."
The London Fire Brigade responded just before midnight Thursday.
About 70 firefighters and 10 engines arrived at the substation on Nestles Avenue in Hayes.
"This was a very visible and significant incident, and our firefighters worked tirelessly in challenging conditions to bring the fire under control as swiftly as possible," Assistant Commissioner Pat Goulbourne said. The fire was under control by 6:30 a.m.
No one was hurt, but 29 people were evacuated from nearby homes. Another 150 were cleared from a 200-meter safety zone.
"The fire has caused a widespread power outage, affecting many homes, local businesses, and Heathrow Airport," Goulbourne said. Some power has returned, but work continues to reduce disruptions.
Fire crews will stay on site to support the National Grid.
Residents were told to keep doors and windows shut as smoke hangs in the air.
UK Transport Secretary Heidi Alexander said she’s monitoring the "fast-moving situation" and getting updates.
"I'm grateful to emergency services responding to the fire, and National Grid for working to restore power to the airport and homes," Alexander wrote on X. "I’d urge passengers not to travel to the airport, and contact their airline."