Heathrow Airport’s terminal 4 was closed and evacuated Monday evening as emergency services responded to an incident, the airport operator said on social media.
Heathrow Terminal 4 has been evacuated because of a “possible hazardous materials incident”.
Holidaymakers are being advised not to travel to the terminal and National Rail trains are not stopping there.
London Fire Brigade said in a statement: “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.”
An airport spokesman said: “Terminal 4 check-in has been closed and evacuated while emergency services respond to an incident.
“We are asking passengers not to travel to Terminal 4 and supporting those on site.”
There are currently no delays to flights departing from or arriving at Terminal 4, according to Heathrow’s online departure board.
But the closure of the terminal to new check-ins will likely cause significant delays.
Trains are no longer stopping at the terminal because of the incident, National Rail said