Police want to trace these three men in connection with a sexual assault of a 17-year-old girl in a city centre underpass.
The plucky teenager slapped one of the men in the face, but not before they had touched her inappropriately, say police.
The victim was walking in the underpass in Midsummer Boulevard, towards Marks and Spencer, last Saturday evening.
Three men walked towards her and blocked her way, say police.
One unzipped her coat and touched her then another also touched her inappropriately.
At this point the girl managed to hit one of the men in the face and run away from them.
If you have any information about the incident, which happened between 7pm and 7.30pm, call police on 101 or Crimestoppers charity anonymously on 0800 555 111.