Up to 150 people were involved in throwing missiles at police during violence after a football match.
Five officers were injured in the disturbance on Saturday after the game between Bristol Rovers and Swansea.
Nine arrests were made after the trouble broke out in Gloucester Road in Bristol, following Rovers' 2-0 win over the Welsh side at the Memorial Stadium.
A police spokeswoman said on Sunday that the nine people arrested had been bailed pending further inquiries.
One officer received hospital treatment after suffering a minor head injury.
Supt Adrian Coombs, of Avon and Somerset Police, said the police operation for the match included the deployment of dogs, horses and the force helicopter.
"There was no serious disorder between rival fans either before, during or after the match," he said.
"When the disorder in the Gloucester Road area started officers were deployed and acted quickly and appropriately.
"Some damage was caused to local businesses but the situation was controlled quickly and officers dealt with it with the utmost professionalism."