, March 21 -- Heathrow Airport, one of Europe's busiest travel hubs, will remain closed throughout Friday after a fire at an electrical substation caused a widespread power outage in parts of west London. The closure is expected to disrupt travel for hundreds of thousands of passengers.

The fire, which broke out late Thursday, resulted in power cuts affecting thousands of homes and businesses. Around 150 people were evacuated after a transformer caught fire at the substation.

"To ensure the safety of passengers and staff, Heathrow will remain closed for the entire day on Friday," the airport said in a statement. "Significant disruptions are expected in the coming days, and passengers should not attempt to travel to the airport until fur...