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What we know about the fire that brought London’s Heathrow Airport to a standstill

▶ Follow the latest updates on Heathrow Airport.

LONDON (AP) — Hundreds of flights to and from London’s Heathrow Airport were canceled on Friday after a fire at a nearby substation knocked out power to Europe’s busiest airport, disrupting travel plans for hundreds of thousands of people around the world.

After a day of chaos, Heathrow began reopening in the evening, with the first plane of the day landing at about 6 p.m. local time. That was just the start of what is expected to be a dayslong process of getting stranded passengers to their destinations and displaced aircraft into the proper locations.

Here’s a look at what happened and its impact on air travel.

What happened?

A fire at an electrical substation in west London, about 3 kilometers (2 miles) from the airport, knocked out power to Heathrow Airport late on Thursday.

The “significant power outage” initially forced officials to announce that the airport would be closed until 11:59 p.m. on Friday “to maintain the safety of our passengers and colleagues.” By late afternoon, the airport said its crews had “worked tirelessly” to restore service, allowing flight operations to restart on Friday evening.

The airport said the first priority would be to begin relocating aircraft so they were in the proper locations for regular