A "violent altercation" at around 02:00 on Friday morning is under investigation by Guernsey Police.
It happened in the North Plantation, with a small number of people directly involved.
A much larger group of people are said to have witnessed the incident and they are being asked to contact the investigating officers.
Anyone who saw anything or who has any information should call PC 145 Kershaw or PC 100 Simon on 222 222 or via Crimestoppers anonymously on 0800 555 111.
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