Multiple people were involved in an incident outside a pub on the Albany in the early hours of Sunday morning.
Guernsey Police said officers are investigating what happened outside the Harbour Lights, at around 00:45 on Sunday 18 January.
“An altercation took place, and officers are appealing for anyone who may have witnessed the incident, or who has mobile phone footage, to come forward,” said a spokesperson for the police. “This will support ongoing enquiries, including the review of CCTV already obtained.”
PC 97 Du Port is leading the investigation and can be contacted on 222 222 or anonymously through Crimestoppers on 0800 555111 quoting reference number OC2600000399.