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St Andrew's College students said a teacher took down the posters and verbally abused them for putting them up - even though they had received prior approval from college management.
Rector Christine Leighton said the teacher's outburst was now a disciplinary matter, but the outcome would not be made public.
In a statement to parents, the rector said that the teacher was Ngāi Tahu and had dedicated her life to opportunities for Māori.