A man suffered facial injuries after trying to break-up a fight outside a Dundee nightclub in the early hours of Monday morning.
The man tried to intervene in a scuffle outside the Underground nightclub on South Tay Street around 2.45am.
His injuries are not thought to be serious.
The perpetrator is described as being a black male around 25-years-old and about 5ft 10 in height.
He was of slim build and wearing a dark long-sleeved t-shirt, dark trousers, a hat and glasses.
Anyone with information that could assist police with their inquiries should contact Tayside Division on 101 quoting CR/13708/17 or speak to any officer.
Alternatively, information can be passed anonymous via Crimestoppers on 0800 555 111.