Rosehill College in the south Auckland suburb of Papakura was placed in lockdown earlier on Thursday following a school fight.
Police confirmed to Newshub they were called to the school after reports of several students fighting at 2:09pm.
An anonymous student told Newshub police were called to the school because students' parents were fighting students on their children's behalf.
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The lockdown has now lifted, and students have been told they can return to class.
The source, who wants to remain anonymous, told Newshub there have been "multiple fights" at the school recently, and said it's an unsafe place.
Another source said those fights lead to gang members from Black Power entering the premises.
Inspector Tony Wakelin from Counties Manukau Police confirmed that a number of police staff attended, however those allegedly involved had dispersed by the time they arrived.
Police were carrying out area enquiries on surrounding streets when they were called back to the college again just before 2:40pm, but there were again no students fighting on their arrival.
Police remain at the school and are making enquiries.
Newshub.
