Police have released images of people they want to speak to in connection with the huge fight between Swansea City and Cardiff City fans at Newbury Racecourse in the summer.
About 60 Swansea and Cardiff fans were involved in the brawl in front of families on 14 July.
A 26-year-old and a 33-year-old, both from Swansea, were arrested on suspicion of affray and later released on bail.
Supt Robin Rickard said: "This was a nasty incident involving up to 60 people fighting in the middle of the afternoon and impacted on lots of innocent people and families who had planned to spend an enjoyable day at the races.
"We will not tolerate this kind of behaviour and are determined to bring to justice all those responsible."