Armed police have responded to an incident at Heathrow Airport in which a number of people were attacked with pepper spray.
Victims were taken to hospital following the disturbance which happened at around 8.10am on Sunday morning.
One man has been arrested on suspicion of assault, but most of those involved are believed to have fled the scene.
Scotland Yard said they were not treating the incident as terrorism and believed it followed an argument involving two groups of people known to each other.
Footage posted on social media showed armed officers running to the scene as travellers arriving at the airport were told to stay in their vehicles.
Some people close to the scene reported “coughing” as a result of a suspected gas being released.
Passengers have been urged to allow more time to get to and from the airport and are being asked to check with their airline in case of any disruption, but Terminal 3 remains open.
