Ashton Gate Stadium is formally investigating an incident that occurred between supporters at the Championship clash between Bristol City and Swansea City on Saturday.
Up to 800 visiting fans arrived at the stadium 20 minutes after kick-off and immediately removed the segregation nets on the east corner of the Atyeo Stand.
The situation was initially dealt with by the stewarding team and police in the vicinity.
Twenty-five Swansea City fans were removed during the game and there were a number of arrests.
Several Bristol City supporters were involved in altercations in the corner of the Atyeo Stand and Dolman Stand before being apprehended.
As a result, two stewards and a police officer were treated for minor injuries.
Ashton Gate Stadium Managing Director Mark Kelly said: “Ashton Gate Stadium has a very strong record of match day safety and I can assure our fans that any home or away supporters that caused this unpleasant experience will be banned."
“The incident in its entirety was captured on CCTV and a formal investigation in conjunction with the Avon and Somerset Police match commander and our head of safety is under way."
“I would like to take this opportunity to recognise our safety team and stewards for taking control very quickly and dealing with this situation.”
Avon and Somerset Police Chief Superintendent Paul Mogg said: “It is very disappointing that a large group of Swansea fans seem to have arrived in Bristol with the intention of drinking to excess and seeking confrontation."
"There was disorder within the ground, with objects thrown by each group of supporters."
“There was further disorder after the match in Ashton Park."
"Officers deployed with dogs and horses to separate the two groups of fans."
“We’ve also had reports of damage at least two pubs."
"We’ll thoroughly investigate these and any other offences disclosed.”