London Mayor Sadiq Khan thanked emergency services for working overnight to tackle the fire at Heathrow that led to the power outage, adding that there had been no reports of any injuries in a statement posted on X.

"I know this will be hugely frustrating for the many thousands expecting to travel to and from Heathrow today, the families who have had their power cut and the commuters who have had their journey disrupted," he said.

He added that electricity suppliers were “working hard to restore power.”

Kazumi Nakamura and her 13-year-old daughter, Mana, from Vancouver, Canada, were among the would-be flyers now scrambling to book new flights.

Standing in Paddington Station as they tried to get on the phone with their airline, Air Canada, Nakamura said she was “a little bit upset,” but thankfully, it was still spring break for her daughter, so they weren’t too worried about getting back home immediately.

“It’s OK. We’re not in a rush,” Nakamura, 50, said. “But we want to go home.”

Mana said she was feeling “a bit overwhelmed,” but that her time in London was worth it, with the mother and daughter taking in some of the city’s biggest stage shows, including “Wicked” and “My Neighbor Totoro.”

“I liked watching all the shows,” she said.

Passengers carrying their luggage were met with empty check-in desks at Terminal 4 of London Heathrow this morning, after a nearby fire shut down operations across one of the world's busiest airports.

At London’s Paddington Station, crowds of people could be seen standing around with luggage, many looking frustrated and forlorn, as updates on the situation at Heathrow rang out in service announcements. 

Security workers at the station said they had expected it to be even busier amid the cancellations, but that they expected the airport closure would continue to cause confusion throughout the day.

Foluke Oleniwen was one of the lucky ones who had just missed all the chaos at Heathrow, safely arriving in London on a flight from Nigeria this morning right as the airport was beginning to shut down.

“I’m relieved and at the same time I feel empathy for people who were affected because that could have been me or anybody,” said, Oleniwen, 40, a support worker based in Gloucester, where she’s headed now. She said she also felt bad for those who risked missing important life events due to the delays, such as weddings and funerals.

Oleniwen said she was told about the fire after she arrived at the airport amid the commotion. “I hope they’ll be able to sort it soon,” she said.

Los Angeles-based comedian Adam Conover was on his way to London for a gig when his flight to Heathrow was diverted midair.

“We were in the air for about it 90 minutes and they had just finished dinner service,” Conover, 42, creator of “The G Word” on Netflix said in a phone interview this morning. “Then the captain came on and said there was a fire … we had to turn around.”

After a brief nap, he said, he’ll be flying to New York’s John F. Kennedy International Airport, where he faces a four-hour layover before flying out to Manchester, with plans to then take an hourslong train ride before finally arriving in London.

He said the journey was a testament to how “hard stand-up comedians work” to make people laugh — and after this experience, he’s likely to have some fresh material.

Australia’s flag carrier Qantas said today it has canceled and diverted fights following the closure of Heathrow.

Its Singapore-London and Perth-London flights were diverted to Paris today, with buses arranged to take customers on to London, a spokesperson said in a statement.

Another flight from London to Perth has been canceled and customers will be accommodated on other flights, the statement said.

“Our teams are working hard to support impacted customers and we thank them for their patience,” the spokesperson added.

Etihad Airways, the United Arab Emirates’ national airline, has canceled four flights following the closure of Heathrow.

One flight previously bound to Heathrow has been diverted to an airport in Germany, the airline said in a statement, with another from Heathrow to the UAE’s capital, Abu Dhabi, delayed until further notice.

Etihad said it’s “working closely” with guests affected to notify them of the changes to their itineraries.

Images emerging from Terminal 4 of London's Heathrow Airport this morning show passengers forced to haul their luggage down a darkened stairwell, using only what appears to be a cellphone to light the way.

British Energy Secretary Ed Miliband called the substation fire that caused the closure of Heathrow “catastrophic.”

A backup generator at the substation near Heathrow Airport was also affected by the fire, Miliband told Sky News, calling the situation “unusual and unprecedented.”

It is “too early to know” what caused the “catastrophic fire,” he said.

Miliband says he has spoken to the National Grid, which controls the country's energy network, about the situation but added that he was reluctant to jump to conclusions about the fire's cause.