A woman in her 20s was reportedly sexually assaulted inside a public toilet on the common on the evening of September the 11th.
The suspect made off towards Cedars Road.
He is described as a man in his 20s, of slim build, with black hair and of Arabian appearance.
At the time of the incident, he was wearing dark grey jeans, with a dark coloured t-shirt.
Anyone who can help the investigation is asked to call 101 quoting CAD 2187/16Oct.
Information can also be shared anonymously with the independent charity Crimestoppers on 0800 555 111.