Police are trying to trace the people in these CCTV images as they investigate an attack by about 15 Crystal Palace supporters on two Millwall fans.
The trouble started on the platform at East Croydon railway station at about 8.35pm on Saturday, April 10.
Six men from Sussex were arrested on suspicion of violent disorder.
Four were men or boys from Hurst Green, two aged 15, one 17 and one 20.
Two 21-year-olds, from East Grinstead and Crawley Down, were also held, along with two men from Caterham in Surrey.
Detective Constable Shazia Moran, of British Transport Police, said: "It's extremely important that we build a clear picture of what took place.
"If you were at the station and witnessed the incident or recognise any of the men featured in the CCTV images then I urge you to get in touch."
Anyone with any information is asked to call British Transport Police on 0800 405040, quoting reference 537 of April 10, or Crimestoppers anonymously on 0800 555111.
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