Teenager

Trevor Bickford - who was also charged with two counts of attempted assault - travelled to NYC by train from Maine before the attack, police said.

US media reported his family recently told the FBI they feared he was being radicalised by Islamist extremists.

Police Commissioner Keechant Sewell said the attack was "unprovoked".

The three officers - one of whom suffered a fractured skull after being struck by the machete - were all released from hospital on Sunday.

The 17-year-old was on his break from working at the Show's 'Break Dance' ride on Monday evening when he became involved in a confrontation about 8pm.

Two groups of males, who police believe could be from rival postcode gangs in Sydney's west, are suspected to be behind the brawl.

Uati was from Doonside, which has the postcode 2767, and friends have told police the people behind his death were from Mt Druitt, with the postcode 2770, the Daily Telegraph reported.

Assistant Police Commissioner Auapaau Logoitino Filipo confirmed to Tala Fou that the Fire & Emergency Services Authority responded to a call reporting the incident and they found the victim unconscious at the shelter.

The teenager was rushed to hospital where he is in a coma with serious head injuries.

The police have since informed the victim’s family in Taga Savaii of his condition.

Police are investigating the incident and are appealing to the public to come forward with any information that will help them find those responsible for beating up the victim.

He was tried behind closed doors and convicted on a charge of theft with violence causing death.

The now 18-year-old was identified as the main person who triggered the woman's fall along the road south of Noumea.

The victim was a 31-year-old nurse going home after a nightshift.

The group of four teenagers was found to have wanted to steal her motorbike but fled when other people came near the scene.

The accident in March last year initially triggered an intense debate on social media over whether her fall was the result of foul play.