Police are investigating a sexual assault that occurred in a laneway in the Melbourne CBD on 1 June.
A 19-year-old woman was walking east, through the laneway between Swanston and Russell streets, at 12.48am.
She was followed by an unknown man who grabbed and sexually assaulted her during a short scuffle.
She managed to break free and run away.
The victim was not physically injured.
Investigators have released an image of a man they believe may be able to assist with their enquiries.
The man is perceived to be Caucasian with a medium build and a brown beard.
He was wearing a black flat peak cap, black hooded jumper with grey sleeves, black pants, runners and was carrying a blue bottle.
Anyone who recognises the man or with information is urged to contact Crime Stoppers on 1800 333 000 or submit a confidential report at www.crimestoppersvic.com.au