Incident at Radio 1Xtra Live in Birmingham
Security staff at Arena Birmingham alerted police to an assault which took place in the backstage area at 10pm on Saturday (5 October).
It's understood that a man sustained a slash wound during the assault. He was treated by on site medical staff and did not require hospital treatment.
Anyone with information can contact West Midlands Police via Live Chat at www.west-midlands.police.uk 8am - midnight, or call 101 anytime.
To remain anonymous call Crimestoppers on 0800 555 111. Please quote crime number 20BW/236014J/19.