Bristol City manager Sean O'Driscoll said that although the match against Bristol Rovers was "tremendous", violence which broke out after the football derby was "disgraceful".
Mr O'Driscoll added: "That's what people will now be talking about...players were disappointed as well. The game was played in good spirit, competitive but not overzealous. We wanted the supporters to act in the same manner but unfortunately they didn't".
Twelve people have been arrested and police officers injured after Bristol City and Bristol Rovers met at Ashton Gate last night. At the end of the game police say fans got on to the pitch and officers worked with stewards to bring them under control.
Known hooligans attached to both clubs were identified and arrested. Three police officers who were injured have received medical treatment. Their injuries aren't thought to be serious.
Bristol City have beaten local rivals Bristol Rovers 2-1 in the Johnstone's Paint Trophy at Ashton Gate this evening.
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.
Staying with football. Bristol City have been drawn against local rivals Bristol Rovers in the first round of the Johnstone's Paint Trophy.
It'll be the first time the two sides have met since 2007 - when Rovers knocked City out of the same competition.
In football, it's the first round of the Johnstone's Paint Trophy tonight. And there's a Westcountry derby, with Bristol Rovers hosting Yeovil Town at the Memorial Stadium. Swindon Town play Oxford tomorrow.
In football, it's the first round of the Johnstone's Paint Trophy this evening. Exeter City are at home to Aldershot, with Yeovil Town away at Bristol Rovers. Plymouth Argyle and Torquay United were given a bye into the second round.