Inspector Ed Van Den Broek said: "We will not tolerate violence of any kind. Retaliation is not justification. It is the job of the police to enforce the law."
He urged parents to take a proactive interest in the lives of their children; know where they are going, who they are spending time with and make sure they are taking sensible steps not to put themselves in risky situations.
He said there was some suggestion that social media sites such as Facebook were being used as a tool for inviting excessive party guests.
"There were serious injuries suffered earlier this month and it could easily have been a lot worse. This is not about scare tactics; this is about parents not having a realistic understanding of the risks that these youngsters face when they go to these parties.," said Insp Van Den Broek.
Police want to hear about large parties and gatherings before they escalate to out-of-control and are keen to hear from anyone with information about planned disorder or retaliation.
- nzherald.co.nz