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A “possible hazardous materials incident” led to the evacuation of Terminal 4 at London’s Heathrow Airport.
Heathrow is among the world’s busiest airports.
According to reports, dozens of flights were delayed because of the chaotic situation.
Around 20 people “reported an injury” and were assessed by paramedics, the BBC noted.
There are no reports of life-threatening injuries.
“An airport spokesperson said the check-in area was closed ‘while emergency services respond to an incident’ and advised passengers not to travel to the terminal in west London. All other terminals at the UK’s busiest airport are operating as normal,” Breaking Aviation News & Videos wrote.
“Firefighters are responding to a possible hazardous materials incident at Heathrow Airport,” a London Fire Brigade spokesperson stated.
“Specialist crews have been deployed to carry out an assessment of the scene, and part of the airport has been evacuated as a precaution whilst firefighters respond,” the statement continued.
Heathrow Airport’s Terminal 4 has been evacuated while emergency services respond to a “possible hazardous materials incident”.
An airport spokesperson said the check-in area was closed “while emergency services respond to an incident” and advised passengers not to travel to the… pic.twitter.com/aqoPeUHdgW
— Breaking Aviation News & Videos (@aviationbrk) September 8, 2025
BBC has more:
A spokesperson at Heathrow Airport said Terminal 4’s check in was closed and evacuated, and passengers were asked not to travel to the terminal.
National Rail then said trains were unable to call at Heathrow Terminal 4, in a post on X.
There was little sign of disruption to flights out of the airport, with no delays or cancellations reported at Terminal 4.
At just after 20:00, a spokesperson for Heathrow Airport said Terminal 4 was reopening, after confirming it was safe to do so.
A short while later, the Fire Brigade announced they were “standing down” their response.
The Metropolitan Police said in a statement that they found “no trace of any adverse substance”, adding that “around twenty people reported an injury, none were deemed to be life-threatening or life-changing”.
Since then, BBC News understands that the events at Heathrow Airport are a “mass hysteria” type event.
“Emergency services have confirmed Terminal 4 is safe to reopen and we are doing everything we can to ensure all flights depart as planned today. We are very sorry for the disruption caused, the safety and security of our passengers and colleagues is our number one priority,” Heathrow Airport later stated.
“We encourage passengers to check with their airline for the latest information about their flight this evening and our colleagues will be on hand into the night to assist,” it added.
Emergency services have confirmed Terminal 4 is safe to reopen and we are doing everything we can to ensure all flights depart as planned today. We are very sorry for the disruption caused, the safety and security of our passengers and colleagues is our number one priority. We… pic.twitter.com/AykEmpgnKh
— Heathrow Airport (@HeathrowAirport) September 8, 2025
The cause of the incident remains under investigation.
Reuters noted:
The British airport’s Terminal 4 – serving both European and long-haul routes – was shut temporarily on Monday evening as specialist crews from the brigade were deployed to carry out an assessment.
Paramedics treated 21 patients and one was taken to a hospital, the capital’s ambulance service said on social media. The nature of the incident has not been disclosed.
Specialist officers from London’s Metropolitan Police also attended the scene and conducted a thorough search of the area, the police force said via email, adding that no trace of any “adverse substance” was found.
Unverified video clips shared online showed dozens of passengers waiting outside the terminal. The departures section on Heathrow’s website showed flights continuing to take off.
Additional coverage below: