Officers investigating violent disorder that followed a right-wing march in Rotherham have issued images of seven men they would like to trace.
Disorder broke out around 4.30pm in the Wellgate area of Rotherham on Saturday, September 5.
It followed a demonstration by around 150 members of Britain First in the town centre in relation to the child grooming scandal.
There was also a counter-demonstration on the day organised primarily by Unite Against Fascism.
A number of people are alleged to have thrown bottles and bricks, causing multiple injuries.
Police arrested 19 men earlier this month, four from West Yorkshire and another 15 from Rotherham, on suspicion of violent disorder.
All remain on police bail pending further consultation with the Crown Prosecution Service.
Investigating officers believe the seven men pictured could hold vital information about the inquiry.
Police believe that image two and eight are the same person.
A South Yorkshire Police spokesperson said: “Are you pictured, or do you recognise anyone in the images?
“If you do, or if you hold any information that could help officers, please call South Yorkshire Police on 101, or email firstname.lastname@example.org, quoting incident number 230 of 5 September 2015.
“Alternatively, you can call Crimestoppers anonymously on 0800 555 111.”
Chief Superintendent Jason Harwin, Rotherham commander, said: “A team of officers have worked tirelessly on this investigation to gather as much information as we can about this incident.”