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Terminal 4 at London Heathrow Airport has been closed following the incident
Heathrow Terminal 4 has been cleared following a potential 'hazardous materials' incident on Monday evening.
A London Fire Brigade spokesperson confirmed: "Firefighters are responding to a possible hazardous materials incident at Heathrow Airport. 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 brigade was first called about the incident at 17:01, and crews from Feltham, Heathrow, Wembley and surrounding fire stations have been sent to the scene."
Meanwhile, according to the Daily Star , a Heathrow Airport spokesperson stated: "Terminal 4 check in has been closed and evacuated