Football Violence At Derby Match Mounted police cleared fans from the pitch after violence broke out at a football derby match in Bristol. Officers moved in when Bristol City fans ran out of the stands at Ashton Gate to celebrate their team's 2-1 victory over Bristol Rovers in the first round of the Johnstone's Paint Trophy. A dozen people were arrested and three officers were given medical treatment for minor injuries, Avon and Somerset Police said. As well as trouble after the final whistle there were also disturbances in the stands, and police in riot gear and stewards were needed to keep rival fans apart. Police are scouring footage of the trouble It was the first time in seven years the bitter rivals had faced each other, and police said the build-up to the game had been peaceful with both sets of fans well-behaved and in good humour. But as fans began to enter the stadium, trouble broke out in and around the ground. Police said that known hooligans attached to both clubs were identified in the clashes, and there might be more arrests. Chief Superintendent Caroline Peters, match commander, said: "The majority of fans were well behaved and enjoyed the match. Mounted police cleared fans from the pitch in minutes However there was a small minority who came with the sole intention of trying to spoil the enjoyment for the majority. We warned before the match that we would not tolerate any form of anti social behaviour or violence. We will now aim to bring the offenders to justice using CCTV coverage and other intelligence and information gathered tonight to bring the offenders to justice. City manager Sean O'Driscoll said afterwards: "It was great up until the final whistle. The scenes at the end are disgraceful.