Gavin Grey: UK correspondent on a person arrested after a string of pepper spray attacks at Heathrow Airport

One person's been arrested after a string of pepper spray attacks at London's Heathrow Airport. Twenty-one people suffered injuries, with five needing hospital treatment, after an argument escalated in a terminal carpark.  Social media footage shows a large armed police response, as the area was temporarily locked down. UK correspondent Gavin Grey told Andrew Dickens police were quick to say it wasn't related to terrorism or a protest. He says the people seemed to know each other, and got into an argument, which led to someone spraying a substance at people they didn't like.See omnystudio.com/listener for privacy information.