Three people have been arrested after a fight between two groups of football fans at Newbury Racecourse. Thirty Cardiff City and Swansea City fans are thought to have been involved in the clash at the Berkshire racecourse on Saturday afternoon.
Thames Valley Police say that of the three arrested - two were for affray and one for a public order offence.
It was not clear why the sets of Welsh fans unleashed their violence at the ground in Berkshire marring the Newbury Summer Festival.
Race track managing director Stephen Higgins said "There was sporadic fighting over about 15 minutes with approximately 30 people involved.
"We have absolutely no idea why it started."
Inspector Phil Rogers of Thames Valley Police said there were only a few minor injuries and no complaints were made to police.
Officers were called at 4.03pm yesterday by the race ground staff.
Mr Rogers said: "Two arrests were made for affray and one for a public order offence.
"The remainder left on buses.
"It appears to be caused by football supporters from Swansea and Cardiff who met in the ground."
Racegoer Julie Davis told the Racing Post: "It was a disgrace and I won't be coming again.
"It took so long to get it sorted out.
"Every time you thought it had stopped it started again. I reckon there were at least 30 people involved. It was scary."
Another punter Denise Mathias told the Post: "It just seemed to be a big fight between football supporters from Cardiff and Swansea. It was terrible. I saw a stocky man covered in blood having his head stamped on."
In an unrelated incident, one person was taken by private ambulance to hospital suffering a suspected heart attack.