Security guards were assaulted by a group of youths after they removed a teenager from a shopping centre in Leeds.
Police have today (Wednesday) appealed for anyone who may have used their mobile phone to film the attack, which happened on Albion Street in Leeds city centre, to come forward.
A group of around six youths punched and kicked two security guards while they were detaining the teen who they removed from St John's shopping centre.
Neither of the men were seriously injured during the incident at around 5pm on January 28, and police said bystanders intervened to help.
PC Neil Clark, of Leeds City NPT, said: "Investigations are progressing into this incident and we would very much like to speak to any witnesses. There were a number of members of public who were present and some of them could have recorded this incident on mobile devices.
"Anyone who has footage or who witnessed the assault and has not spoken with us is asked to contact PC 3124 Andrew Bayliss at the City NPT on 101.
"Information can also be given anonymously to the independent Crimestoppers charity on 0800 555 111."