A teenager has been flown to Southampton for surgery after suffering a serious head injury during a fight.
The 18 year old was briefly knocked unconscious during the fight that broke out in Liberation Square at around 1:15am on Monday (22nd April)
One man was arrested at the scene and bailed while investigations continue.
Jersey Police want to speak to anyone in the area at the time, particularly two men seen talking to the pair involved in the fight immediately before it happened.
The force says it's also keen to track down another man who may have recorded the incident on his mobile phone.
Anyone with any information is asked to contact police on 612612 or the independent charity Crimestoppers anonymously on 0800 555 111 or via their anonymous online form at Crimestoppers-uk.org.

Railway Walk reopens 'several weeks' ahead of schedule
New bar opening at former Rojo and X site to evolve Jersey's nightlife
Former Chief Minister seeks re-election
Château Vermont to become home to new music campus
St Saviour break and entry suspect pictured posing on motorbike
'Overstretched' neurology department following under-experienced managers
Channel Islanders asked to report injured or dead seabirds
'Concerning' e-bike rider not stopping for police