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A fight on Community Square was caught on camera and uploaded to YouTube.
Police say the incident was reported by CCTV operators in the early hours of Saturday morning.
A spokesman said they were called to Stone Street, outside Bar 24, at 12.25am.
The video shows officers arriving sharply to the scene but those involved refused to disclose any offences.
A number of punches are seen being thrown.
One man seen removes his shirt having been ducking and weaving around another person involved.
There is shirt pulling and women can be heard screaming and shouting.
About eight people are visible on the video but as the sound of sirens gets closer, the group quickly disperses.
No arrests were made and everyone continued with their night out.