Police are appealing for information about the fight that broke out near the Havre des Pas Lido on Monday evening (18 May).
It involved up to 20 people, but the force thinks only a small number of those were physically fighting.
Two boys were arrested. A 16-year-old on suspicion of grave and criminal assault and a 17-year-old on suspicion of a breach of the peace.
They've been released on bail while enquiries continue.
Anyone who saw what happened or has any information is asked to call police on 612612, Crimestoppers anonymously on 0800 555 111 or via the online form.


Phone robber jailed after targeting a 'lone' woman
Channel Islands' parliamentary Standards Commissioner resigns
Island Energy charged over Mont Pinel gas explosion
Jersey airport to open early due to broken scanner
Critically endangered species of lemur joins Jersey Zoo
Lido to 'pause trading' amid ongoing uncertainly
Ports of Jersey applies to remove Gorey Pier landing stage
Jersey's police officers to be held to new standards
Comments
Add a comment