A group of people involved in violent clashes with police could be from Sheffield and the force are appealing for help to identify them.
Sussex Police has issued images of 11 men and women involved in a fight.
The incident happened at a March For England protest.
It saw a group of people throw tables, chairs, pint glasses and bottles at police when they were stood outside a pub.
The incident on April 27 took place outside The Dorset Pub on the corner of Gardner Street and North Road in Brighton.
Shortly after 2pm two groups of people were involved in ‘serious disorder’ between the pub and Infinity Foods and was believed to be connected to the march and counterprotest which had taken place on the seafront earlier that day.
Police believe these 11 men and women could have connections to the Sheffield area.
A force spokesman said the men labelled as B, E and K specifically are thought to have links to the Sheffield area, based on intelligence that some people may have travelled to Brighton from Sheffield for the march.
Police made 27 arrests and charged six people.
Detective Inspector Vicki Harris said: “Our attention has been focused on this nasty incident which happened in front of a lot of people out shopping and we are determined to catch these people.
“This behaviour was completely unacceptable and we will not tolerate it in our city.
“We know someone will recognise these men and women and we are appealing to those people to give us a name.
“Some of these people we believe to be from the Sheffield area, however some of them could be from elsewhere in the country.
“On the day we made 27 arrests connected to some disorder in the city and six people have been charged.
“A further six were fined or cautioned and we are determined to bring those who were also involved to justice.”
Those with information are asked to call 101 or email firstname.lastname@example.org quoting Operation Bearwood, or call Crimestoppers on 0800 555111.