It happened on Saturday morning at The Range in Girlington.
Police are investigating following an assault in Girlington at the weekend.
The incident happened at The Range on Thornton Road at around 11am on Saturday 25 July.
The male victim approached another male who he believed had been shoplifting, an altercation ensued and the victim was punched in the face, causing a nose bleed.
The suspect left the store.
The suspect was described as a black male, 5ft 8”, wearing a grey hooded coat, black cap, black trousers and carrying a red bag.
Enquiries are ongoing, including examination of CCTV in the area.
Anyone who witnessed the incident or has any further information is asked to contact the police via 101 quoting crime reference number 13200372781 or information can be passed to Crimestoppers anonymously on 0800 555 111.