A football fan has been stabbed and another taken to hospital after their coach was attacked.
The two men were among five bus-loads of supporters who had travelled to back Kidderminster Harriers in their non-league away fixture against Luton Town FC.
Bedfordshire Police said that as the coaches queued in traffic about a mile from the Kenilworth Road ground an argument broke out between "local residents" and the Kidderminster supporters in the rear coach.
It happened after the game ended as the vehicles were leaving Luton on the return journey, police said.
"It led to the coach being attacked," said a police spokesman.
"Then some of the supporters got off to remonstrate and a fight ensued.
"Two Kidderminster fans are being treated in hospital for non life-threatening injuries, although one was stabbed twice."
Four local men have been arrested and a police presence remains in the area where the violence broke out in Dunstable Street near the Mansfield Road junction.
Police said the attackers did not appear to have any connection to Luton Town.
Kidderminster won the Conference Premier fixture 2-1, leaving them top of the table.