A terminal at London's Heathrow Airport was evacuated Monday after emergency personnel reported a possible hazardous material, the London Fire Brigade said.
The brigade said crews were called to the scene and the terminal was cleared while specialists investigated the nature of the substance. Officials did not immediately identify which terminal was affected or report any injuries.
Emergency responders remained on site as assessments continued and authorities worked to determine whether any controlled areas needed to remain closed. Heathrow Airport and police had not released additional details by the afternoon and were contacted for comment.
Heathrow is Britain’s busiest international airport, handling tens of millions of passengers annually. The airport and emergency services have established procedures for responding to hazardous materials and other security or safety threats, with coordinated evacuations and specialist patrols available to protect passengers and staff.
Incidents involving potential hazardous substances typically prompt containment measures, search and identification by Hazardous Materials (HAZMAT) teams, and coordination with police and airport operations to limit disruption and ensure public safety. Passengers affected by the evacuation were directed to follow instructions from airport staff and emergency personnel.
Authorities said the investigation was ongoing and urged anyone with information or concerns to follow updates from official sources and the airport. Flight operations and the broader impact on travel schedules were not immediately clear.