Heathrow Terminal 4 has been declared safe to reopen after a hazardous material scare prompted its evacuation on Monday evening. The Metropolitan Police confirmed that no trace of any adverse substance was found following a thorough search of the area.
Approximately 20 people reported injuries, but none were deemed life-threatening or life-changing. The London Ambulance Service treated 21 patients, with one taken to hospital and the others discharged at the scene.
Police were called to the terminal at 4:56pm, with the London Fire Brigade arriving shortly after. Specialist officers conducted a search alongside the fire brigade and ambulance service. The cause of the incident remains under investigation.
Heathrow Airport advised passengers not to travel to Terminal 4 during the incident, and National Rail Enquiries reported that trains were unable to call at the terminal. By 8:27pm, the airport confirmed on X that the terminal was safe to reopen, and efforts were underway to ensure flights departed as planned.
Transport Secretary Heidi Alexander said she was monitoring updates from the scene. Despite the disruption, most flights from Terminal 4 were largely unaffected, with only a few delays expected.
