The victim was taken to hospital where he has been treated for what is described as a life changing injury.
Detective Constable Allyson Ferguson at Stewart Street Police Office said: “This appears to have been a totally unprovoked attack on a man waiting on his bus home after a night out.
"I would ask anyone who may have witnessed this attack, or who has any information which could help in the investigation to call us on the 101 number, quoting the reference number 1999 of 4 October.”
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