Officers from South Yorkshire Police said they were aware of at least one video circulating on social media and they were keen to speak to anyone who has footage to get in touch to help investigations.
Trouble flared in the Wellgate area on Saturday, following the demonstration in the town centre. At around 4.30pm, a group of people were reportedly involved in disorder near to the William Fry pub in Wellgate.
Bottles and bricks were thrown by individuals within the group and a number of people were assaulted.
A review of CCTV in the local area is now underway and officers are keen to hear from anyone that was in the area at the time.
Temporary Det Insp Steve Brookes said: “We know that there is at least one video of the incident circulating on social media pages and I’d urge anyone who filmed or photographed the disorder to get in touch, as this could contain vital evidence.
“It is miraculous nobody was seriously injured and we want to reassure the local community that we are making extensive enquiries to identify the individuals involved.
“In addition to the CCTV trawl and the investigation of material on social media, we are carrying out house-to-house enquiries and speaking with local businesses.”
Call 101 with information or if people have footage or photographs they should email: [email protected] and quote incident number 230 of 5 September 2015.