At about 2.15am on Saturday March 12, a 20-year-old woman was assaulted by a man she did not know, while she was walking on Antill Street in Watson.

The man then left the area driving a white Volkswagen Caddy van, or similar vehicle.

The alleged offender is described as being 20-30 years old, about 170cm (5'10") tall, with dark hair, dark eyes and of slim build.

Police are calling for public assistance to identify the man depicted in the face-fit, or for anyone who may have witnessed the incident to contact them.

The face-fit image is a graphical representation of a face as constructed by an artist who works with a witness.

Anyone who believes they know the identity of the man, saw the white van, or has other information that can assist police is urged to contact Crime Stoppers on 1800 333 000, or via the Crime Stoppers ACT website.

Quote reference 7055880. Information can be provided anonymously.