Guernsey Police are appealing for witnesses to the incident which happened at the bottom of Victoria Road between 00:05 and 00:15 today [Wednesday 19 June].
It is believed that a number of people may have witnessed the altercation and anyone who did is asked to assist the investigation by contacting PC 123 Cusack on 725111, quoting crime reference number OC1900004457.
Alternatively you can contact Crimestoppers anonymously on 0800555111.