Two men were injured and 13 were arrested following disorder that broke out after an FA Youth Cup match in Birmingham.
The incident occurred in Birmingham on Saturday night after a football game between the Millwall and Aston Villa youth teams.
Two men were found with injuries after being attacked, West Midlands Police said.
One of the men, aged 41, suffered bruising, and the other, a 42-year-old man, suffered a cut to his head after being attacked with what officers believe was a bottle.
The attack was thought to be a racially aggravated assault, said police, who were called to Aston Lane at Wenlock Road, Aston, at about 8.30pm.
A short time later, officers stopped a private minibus in Witton Lane outside the Aston Villa coach park and 13 men aged between 20 and 40, all from the London area, were arrested in connection with the incident.
They are currently helping police with their inquiries.
Police are appealing for anyone who may have seen the attack or anyone who may have seen a minibus driving around the Aston area between 8pm and 9pm on Saturday night to contact them.
The minibus is described as a white Transit van with Premier Travel Services written on the side in blue lettering and dark tinted windows.