"This behaviour goes against our school values and will not be tolerated as students' safety is our highest priority."
A police spokesperson had previously said the school was locked down as the brawl was contained.
Craggs said the school had added several extra measures to help prevent similar events.
"These include, extra security onsite, supervised quiet spaces for students at break times and increased senior staff presence.
"This week, our students have responded amazingly and have been settled and keen to get on with their learning. Students have made it clear that this does not accurately reflect our school."
On August 24, the school hosted a community hui where the situation was discussed openly.
About 400 people attended and Craggs said students and families were able to share concerns.
"Student safety was a key concern and attendees were able to be reassured by the measures put in place," he said.
"From the meeting, there was community support for the school to move forward and address issues raised together."
Auckland's Manurewa-Papakura Ward councillor Daniel Newman told the Herald the meeting was "confronting but constructive".
"I think principal Simon Craggs has a tough brief but he cares deeply about the school and his commitment to it is obvious.
"I am impressed with the immediate changes that have been implemented and the disciplinary response has been swift."
Newman, a former student of the school, said he wants the community to know "the school is safe".
"The school acted well and their disciplinary approach to the incident was swift and proportionate."
