Police are concerned about an increase in "absolutely disgusting" behaviour organised by young people on social media.
A vicious brawl among schoolgirls from Manurewa High School in South Auckland has gone viral, with footage of the scuffle garnering more than one million views online.
The school's principal, Pete Jones, said what happened made him feel sick. Mr Jones said there would be consequences for the pupils involved in the South Auckland brawl, possibly including suspension.
"Once we've worked with police to identify exactly who they are then there's processes within the school, so they'll be referred to the board of trustees. There's a consequence to actions," he said.
"We do everything in our power as a school to make sure our students are safe and where they're meant to be."