On Monday, 8 September, London Heathrow Airport Terminal 4’s check-in area was temporarily closed due to an incident that potentially involved hazardous materials. After a partial evacuation and an intervention by specialists, the terminal was able to reopen just three hours later, and no hazardous materials were found.
At 5:01 pm on Monday, 8 September 2025, the London Fire Brigade were asked to respond to a possible hazardous materials incident at Heathrow Airport, minutes after the Metropolitan Police was informed about the event. The impacted area of the airport, Terminal 4 and more precisely its check-in area, serves both European and international destinations and is serviced by airlines such as Air France, Bulgaria Air, China Southern, Etihad Airways, Korean Air, and Qatar Airways.
Crews from Feltham, Heathrow, Wembley, and surrounding fire stations answered and carried out an assessment of the scene, looking for any traces of hazardous materials. During that time, Terminal 4 was partially evacuated, and according to the BBC, people could be seen queuing outside the terminal.
🚨🇬🇧#BREAKING | NEWS ⚠️
— Todd Paron🇺🇸🇬🇷🎧👽 (@tparon) September 8, 2025
London’s Heathrow airport terminal 4 has been evacuated as a hazmat team in fire department are looking into a possible hazardous material incident.
This is causing a major back up at the airport. Story is developing. pic.twitter.com/5KihBgeh0z
Limited impact
Passengers were asked to stay away, while the National Rail said trains were unable to call at Heathrow Terminal 4. However, although the specific issue at hand remained unclear, 21 people reported an injury and were checked by paramedics, one of whom was taken to the hospital.
Around 9:00 pm, the terminal was able to fully reopen. Despite the closure, the impact on air traffic at the world’s busiest airport was minimal, with no delays or cancellations reported at Terminal 4.
Heathrow Airport's Terminal 4 has been evacuated while emergency services respond to a "possible hazardous materials incident".
— Breaking Aviation News & Videos (@aviationbrk) September 8, 2025
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
“Emergency services have confirmed Terminal 4 is safe to reopen and we are doing everything we can to ensure all flights to 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 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”, a Heathrow spokesperson said once the terminal reopened.
Given the circumstances of the event, with no traces of hazardous materials being found and just one person being taken to the hospital, BBC News seems to understand that the incident was caused by mass hysteria.
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
“We conducted a thorough search of the area. No trace of any adverse substance was found. Around twenty people reported an injury. None were deemed to be life-threatening or life-changing. Enquiries are ongoing”, a Metropolitan Police spokesperson said in a statement.
Whether or not the mass hysteria nature of the event will be confirmed by the Metropolitan Police is up in the air at the moment of writing.
