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The 34-year-old woman, who suffered minor injuries, was left traumatised by the incident, just before 11pm.
The offender was described as a stocky Caucasian aged in his late 30s or early 40s, well-dressed, smelling of alcohol, and was referring to the victim as ''love''.
Detective Sergeant Chris Henderson said police wanted to speak to anyone who was in the area about the time of the incident.