Four people were injured and 17 people were arrested after a fight broke out at London Luton Airport.
Bedfordshire Police said the incident happened at about 08:00 BST on Friday.
The force said three people were taken to hospital with serious injuries and those arrested, on suspicion of violent disorder, were taken into custody for questioning.
A spokesman for the airport said it was "shocked and saddened" by the incident in the airside main departure lounge.
He added: "We take a zero tolerance approach to violence and continue to assist the police with their inquiries. We would like to sincerely apologise to any passengers affected."
There is video of the incident at
https://www.bbc.co.uk/news/uk-englan...herts-57127034