During the fight, he said a vehicle collided with people at the scene, knocking at least two people to the ground.
One of those knocked over, a teenage boy, had also been stabbed at the scene.
He was transported to hospital in a serious condition, underwent surgery, and was in a stable condition yesterday.
Police went to the scene at the time and have been making inquiries.
Dalzell said police have been working with the local community to determine why the incident occurred and to identify those responsible.
"It is incredibly fortunate that this violent altercation did not result in further serious injuries or worse, become a homicide investigation."
An online portal https://kwik.nzpolice.org/ has been set up for people to submit photos or video to the police investigation.
Anyone with information is asked to call 105 quoting the file number 210923/4363 or Crimestoppers anonymously on 0800 555 111.