Tamaki College posted a message to the community via its Facebook page.
"We have been made aware that there is a very disturbing video of an assault taking place outside a house in our community that is circulating on social media," principal Soana Pamaka wrote.
"Tamaki College does not endorse violence of any kind. We continue to provide a safe learning environment for students and whanau.
"This incident has been dealt with by the school and is being dealt with by the NZ Police.
"We ask for your patience and understanding to allow the NZ Police to deal with this the right way and ask that we support our school, community and both of the families as we work through this difficult situation.
"One way to support this is to report the video so that it stops circulating."
Police told the Herald that the alleged assault remains under investigation.
"We are working to identify the parties involved so we can address the issue," a police spokesperson said.
"Police are aware of video footage circulating depicting the incident. We are concerned by the violence shown in the video and ask the community to cease sharing footage any further."