He was transported to hospital in a serious condition, but is now stable after undergoing surgery.
Northland police responded to the scene at the time and have launched an investigation, calling for witnesses or anyone with information to come forward.
"Police are aware this incident may have been recorded by onlookers and are seeking their assistance as part of the investigation," said Dalzell.
An online portal has been set up for people to submit photos or video to the investigation.
You can also call 105 quoting the file number 210923/4363 or Crimestoppers anonymously on 0800 555 111.
"Our priority has been working with the local community to determine why this incident occurred and to identify those people responsible," said Dalzell.
"It is incredibly fortunate that this violent altercation did not result in further serious injuries or worse, become a homicide investigation."