A man has been taken to hospital with serious head injuries after a brawl outside a 21st birthday party in the Auckland suburb of New Lynn.
The 22-year-old is in a critical but stable condition at Auckland Hospital, while several others suffered minor injuries.
Police say they received more than a dozen calls at about 2am on Sunday saying that the party, which was being held in a warehouse in Riverbank Road, was getting out of control.
They say a fight started in the street and several cars were smashed.
Detective Senior Sergeant Stan Brown says at least 200 people were at the party.
He says it could take days to find out what happened in the brawl.
Meanwhile, eight people have been arrested.