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A man has been arrested on suspicion of assault after a number of people were attacked with a "form of pepper spray" by a group of men at Heathrow Airport.
Emergency services rushed to the scene at Terminal 3's multi-storey car park shortly after 8am on Sunday.
Police said a number of people were sprayed with a substance by a group of men who left the scene.
The incident, which is not being treated as terrorism, is believed to have been sparked by an argument between a group of people who are known to each other.
According to the London Ambulance Service, the victims were taken to hospital with minor injuries.
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