A teenager has been arrested on suspicion of assaulting a 62-year-old man who has suffered a serious head injury.
The victim is receiving hospital treatment for an injury sustained in St Helier on Sunday afternoon (5 March).
Two men were arguing on Albert Street at around 5pm.
The argument turned physical, resulting in the injury to the 62 year old.
A 17 year old boy has been arrested on suspicion of grave and criminal assault and is still in police custody.
Anyone who witnessed the incident is asked to contact the police on 612612 or Crimestoppers on 0800 555 111 or via their anonymous online form at Crimestoppers-uk.org.

New 'competitiveness' plan to protect Jersey's £3bn financial sector
Fines for 'Jersey Lifts' drivers a step closer?
£225K grant given for clinical trial into heart failure
New school grouping system to address pressures on Education
Jersey to nearly quadruple its protected waters
Broad Street turns a new leaf
Ministers unsupportive of legislation to protect cash-use
Woman, 44, guilty of inappropriately touching a teen at Portelet