By . James Rush . PUBLISHED: . 03:06 EST, 5 September 2013 . | . UPDATED: . 06:46 EST, 5 September 2013 . A fierce local derby was marred by violence and a pitch invasion last night as about 12 people were arrested and three police officers were injured. Mounted police were called in to clear the pitch at Ashton Gate after Bristol City fans celebrated their victory over rivals Bristol Rovers. Avon and Somerset Police said about 12 people were arrested and three offices received medical treatment for non-serious injuries. VIDEO Scroll down to watch Bristol City and Rovers fan riot . Pitch invasion: Bristol City fans invade the pitch following their team's victory over bitter rivals Bristol Rovers . Officers: Mounted police were needed to clear the pitch at Ashton Gate as Bristol City fans celebrated the win . Ugly scenes: Stewards hold back the Bristol City fans after they invaded the pitch at Ashton Gate . Video courtesy of bristolpost.co.uk . Police in riot gear and stewards were also required to keep rival fans apart following disturbances in the stands. The match was the first time in seven years the bitter rivals had faced each other. 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 for last night's Johnstone’s Paint Trophy first round match, small isolated pockets of anti-social behaviour broke out in and around the ground. Police said known hooligans attached to both clubs were identified and so far around a dozen people had been arrested. Chief Superintendent Caroline Peters, match commander, said police and stewards were able to clear the pitch of supporters in a matter of minutes. Trouble brewing: Citys fans (right) are kept away from Rovers supporters by stewards during the match . Spark: City fans begin to celebrate after seeing Joe Bryan score the winning goal . She said: 'The majority of fans were well behaved and enjoyed the match. '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.' Crackdown: Police said they made about 12 arrests following disturbances at the match . Dangerous: Police and stewards had to be on-hand to keep supporters at bay . Joy: Local boy Joe Bryan netted the winner for Bristol City . VIDEO: Trouble flares on the streets of Bristol . Jay Emmanuel-Thomas put the hosts ahead in the 12th minute with a long-range strike. Rovers equalised just before the hour mark when Mark McChrystal headed in a free-kick. But Bristol-born Joe Bryan struck an impressive winner to send City through to the second round. City manager Sean O’Driscoll said afterwards: 'It was great up until the final whistle. The scenes at the end are disgraceful.' The new season is not even a month old but it is not the first incident of crowd trouble in English football this term. Disturbances: A steward was trampled by a police horse as Preston fans invaded the pitch last month . Tom . Clarke’s 87th-minute winner for Preston against bitter rivals Blackpool . sparked ugly scenes last month which ended with a steward being . trampled by two police horses and taken to hospital. The Lancashire derby atmosphere boiled over when hundreds of home supporters flooded the Deepdale pitch at the final whistle. And . on Saturday police were pelted with bottles and missiles after trouble . broke out between Port Vale and Wolverhampton Wanderers fans after the . local rivals League One clash. Officers arrested 23 people during the . violence. Disgrace: These images show police holding a line to stop Port Vale and Wolves fans clashing . After the . final whistle, the trouble spilled over into nearby Burslem town centre . in Stoke-on-Trent, where missiles were thrown at officers and a marked . police car was smashed up. Staffordshire . Police said it was 'confronted by a significant group of home fans' involved in 'violent disorder' who had gone out of their way to target . police lines. There were reports innocent bystanders were also caught up in the melee. Nine . people were detained before kick-off while another four were arrested . during the match for offences including setting off flares and going on . to the pitch. Two adults also suffered dog bites from police dog units and were treated by paramedics according to the force.
Mounted police were called in clear pitch at Ashton Gate following derby .
Police said about 12 people arrested and three officers received treatment .
It was the first time in seven years the bitter rivals had faced each other .
By . James Rush . PUBLISHED: . 03:06 EST, 5 September 2013 . | . UPDATED: . 06:46 EST, 5 September 2013 . A fierce local derby was marred by violence and a pitch invasion last night as about 12 people were arrested and three police officers were injured. Mounted police were called in to clear the pitch at Ashton Gate after Bristol City fans celebrated their victory over rivals Bristol Rovers. Avon and Somerset Police said about 12 people were arrested and three offices received medical treatment for non-serious injuries. VIDEO Scroll down to watch Bristol City and Rovers fan riot . Pitch invasion: Bristol City fans invade the pitch following their team's victory over bitter rivals Bristol Rovers . Officers: Mounted police were needed to clear the pitch at Ashton Gate as Bristol City fans celebrated the win . Ugly scenes: Stewards hold back the Bristol City fans after they invaded the pitch at Ashton Gate . Video courtesy of bristolpost.co.uk . Police in riot gear and stewards were also required to keep rival fans apart following disturbances in the stands. The match was the first time in seven years the bitter rivals had faced each other. 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 for last night's Johnstone’s Paint Trophy first round match, small isolated pockets of anti-social behaviour broke out in and around the ground. Police said known hooligans attached to both clubs were identified and so far around a dozen people had been arrested. Chief Superintendent Caroline Peters, match commander, said police and stewards were able to clear the pitch of supporters in a matter of minutes. Trouble brewing: Citys fans (right) are kept away from Rovers supporters by stewards during the match . Spark: City fans begin to celebrate after seeing Joe Bryan score the winning goal . She said: 'The majority of fans were well behaved and enjoyed the match. '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.' Crackdown: Police said they made about 12 arrests following disturbances at the match . Dangerous: Police and stewards had to be on-hand to keep supporters at bay . Joy: Local boy Joe Bryan netted the winner for Bristol City . VIDEO: Trouble flares on the streets of Bristol . Jay Emmanuel-Thomas put the hosts ahead in the 12th minute with a long-range strike. Rovers equalised just before the hour mark when Mark McChrystal headed in a free-kick. But Bristol-born Joe Bryan struck an impressive winner to send City through to the second round. City manager Sean O’Driscoll said afterwards: 'It was great up until the final whistle. The scenes at the end are disgraceful.' The new season is not even a month old but it is not the first incident of crowd trouble in English football this term. Disturbances: A steward was trampled by a police horse as Preston fans invaded the pitch last month . Tom . Clarke’s 87th-minute winner for Preston against bitter rivals Blackpool . sparked ugly scenes last month which ended with a steward being . trampled by two police horses and taken to hospital. The Lancashire derby atmosphere boiled over when hundreds of home supporters flooded the Deepdale pitch at the final whistle. And . on Saturday police were pelted with bottles and missiles after trouble . broke out between Port Vale and Wolverhampton Wanderers fans after the . local rivals League One clash. Officers arrested 23 people during the . violence. Disgrace: These images show police holding a line to stop Port Vale and Wolves fans clashing . After the . final whistle, the trouble spilled over into nearby Burslem town centre . in Stoke-on-Trent, where missiles were thrown at officers and a marked . police car was smashed up. Staffordshire . Police said it was 'confronted by a significant group of home fans' involved in 'violent disorder' who had gone out of their way to target . police lines. There were reports innocent bystanders were also caught up in the melee. Nine . people were detained before kick-off while another four were arrested . during the match for offences including setting off flares and going on . to the pitch. Two adults also suffered dog bites from police dog units and were treated by paramedics according to the force.
officers were injured. Mounted police were called in to clear the pitch at Ashton Gate after said about 12 people were arrested and three stands. The match was the first time in seven years the bitter rivals had faced each other.