A woman was taken to hospital with facial injuries after an alleged assault in Colours Nightclub on Saturday night.
Police are investigating the incident which happened around 1.25am. close to the smoking area.
The injured woman received treatment for her injuries and was later discharged.
Police say it was a shocking assault and are looking for another woman in relation to the incident.
They say the club was particularly busy at the time.
Anyone with information is asked to ring police headquarters on 631212 or Crimestoppers on 0800 555 111.