Armed police were sent to London's Heathrow Airport on Sunday due to an unspecified incident in Terminal 3's car park.
"Passengers are advised to allow extra time when travelling to the airport and to check with their airline for any queries," the airport said on X.
Unconfirmed reports on social media cited gas being sprayed in the area.
British media outlets said public transport has been halted. Heathrow tunnels have been reportedly closed, with LUL and Elizabeth Lines suspended.
"We were called at 8.14am today to assist emergen
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