Firefighters responded to a possible hazardous materials incident at Heathrow Airport.
The Brigade was informed that several people were reporting a variety of minor symptoms, which could indicate exposure to a chemical or another type of substance. As is routine for these types of incidents, specialist crews were deployed to carry out an assessment of the scene. We can confirm no elevated levels of hazardous materials were discovered by the Brigade and the area was declared safe.
Terminal 4 check-in was evacuated as a precaution whilst firefighters conducted operations. Around 20 people were assessed on scene by paramedics from the London Ambulance Service, with one person taken to hospital as a precaution.
The Brigade was first called about the incident at 1701, with crews from Feltham, Heathrow, Wembley and surrounding fire stations mobilised to the scene. The Brigade was stood down by 1926.