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No trace of any “adverse substance” has been found after emergency services were called to Heathrow airport on Monday, the Metropolitan Police has said.<\/p>\n
Terminal 4 was partially evacuated as fire crews investigated “possible hazardous materials” at the airport.<\/p>\n
Heathrow’s spokesperson apologised for the disruption and said they were working with airlines to ensure flights departed on time.<\/p>\n
The London Fire Brigade (LFB) said crews were called to the terminal at about 17:00 BST to carry out an assessment of the scene, and Terminal 4 check-in was evacuated as a precaution.<\/p>\n<\/div>\n
Earlier, National Rail said trains were unable to call at the terminal “due to the emergency services dealing with an incident”.<\/p>\n
Firefighters were stood down at around 20:20 BST and both the LFB and Metropolitan Police have said the cause of the incident remains under investigation.<\/p>\n
In a statement, the Met said: “Specialist officers attended the scene alongside the London Fire Brigade and London Ambulance Service and conducted a thorough search of the area.<\/p>\n
“No trace of any adverse substance was found.”<\/p>\n
The Met said none of the people who reported injuries were “deemed to be in a life-threatening or life-changing condition”.<\/p>\n
“Enquiries are ongoing,” the force added.<\/p>\n
Twenty-one people were assessed by the London Ambulance Service, with 20 discharged at the scene and one taken to hospital.<\/p>\n
A Heathrow spokesperson said it reopened to passengers shortly after 20:00 and they were “very sorry for the disruption caused”.<\/p>\n
In a post on X, the airport said it was doing “everything we can to ensure flights depart as planned today”.<\/p>\n
Disruption to flights landing and departing from Terminal 4 appeared minimal while the evacuation was under way, according to flight data.<\/p>\n<\/div>\n