Officers were called to the assault on Saturday evening which occurred in the alleyway leading to the back of Boyes car park and The Wine Bar.
A man, 19, suffered serious injuries and has since been released from the hospital.
Officers are investigating and are appealing to anyone who was in that area at that time and who may have witnessed something to get in touch.
Anyone with information can report online at https:///orlo.uk/cJJLP, quoting incident 255 of April 16. You can also phone on 101.
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