In May a mid-afternoon confrontation between rival gangs at a Kaikohe service station led to 13 people eventually being arrested over the violence.
Police have also been called to the school on many occasions recently, including two months ago after a former staff member reportedly sent students to verbally abuse teachers and destroy property. The main safety concern at the school was the physical violence between students, Mr Forbes said.
"I think it's always been there but I think it's come to a head lately."
As the school had taken a tougher stance in recent months the behaviour had improved, he said.
Police acting senior sergeant Pat Davis said they were working with other agencies to assist with the school's needs as required, though declined to comment on any specific issues.
Ministry of Education head of sector enablement and support Katrina Casey said a limited statutory manager was appointed in 2013, with Mr Forbes taking over governance at the school a year ago.
The Education Review Office report which sparked the intervention found risks to operation and educational performance. There were no discussions with the community about shutting the school at this stage, Ms Casey said.
"We remain committed to supporting the school as it resolves its difficulties and we are also available to talk to parents or members of the community who may have concerns."
The intermediate, along with the two local primary schools - Kaikohe East School and Kaikohe West School - and Northland College sent out a survey to parents at the end of last term. It came after the principal formally resigned after being on leave for six months.
Mr Forbes said before advertising for a new principal it was an opportunity to gauge public opinion. "What it may trigger, I think, is once that information is collated is there should be a review carried out across the whole community," he said.
Parents were given five options including closing the intermediate, expanding the other schools or expanding the intermediate to a middle school. Mr Forbes said since the survey many people had come forward supporting the school. "There is a mandate for change but what that change may look like is open for discussion."
Northland College principal Jim Luders said the surveys received so far, which were due back next week, did not yet paint a clear picture of what parents wanted.