Fans of Liverpool and Manchester City were involved in a mass brawl on the London Underground.
Multiple supporters of both sides are seen to be scrapping on the Metropolitan Line service ahead of Sunday's Community Shield at Wembley.
Liverpool and City were facing off in the annual season opener, which is competed between two of England's best teams from the previous campaign.
In a video shared on social media, punches are seen to be exchanged in the vestibule area of a tube train.
The train, likely on its way to Wembley Park station, was parked at Great Portland Street station when the violence broke out.
One set of supporters is seen on the platform, while the others were inside the entrance of the train. The fighting began at the doors of the train.
At one point, a member of the crowd can be seen climbing up from the floor, while another man can be seen falling backwards later in the clip.
Among the crowd, one fan is seen to have a bottle of beer in his hand as the violence ensues.
Other gentlemen in the clip are later seen trying to calm down proceedings.
No injuries have been reported.
A statement from the British Transport Police said: "BTP officers were called at 2.02pm today 04/08 following a report of a large fight at Great Portland Street Station, London.
"The fight is reported to have involved football fans.
"Enquiries into the incident are ongoing.
"Officers are working to identify those involved and at this time no injuries have been reported to the police.
"No arrests have been made.
"Anyone who witnessed the incident is asked to contact BTP by texting 61016 or by calling 0800 40 50 40 and quoting reference 319 of 04/08/19."
