Napier Girls' High School has cancelled tonight's school ball citing health and safety concerns based on information from police.
The school principal, Dawn Ackroyd has posted a message on social media to parents, caregivers and students.
"Unfortunately we are cancelling tonight's ball for health and safety concerns based on latest information from Police," she wrote.
"To reiterate the NGHS ball is not going ahead, please do not turn up at the venue," Ms Ackroyd added.
In a statement police say they "have been working with Napier Girls High School after they received a threat against the event planned for tonight".
"Police have been actively investigating the threat received and have been working closely with the school."
"Police will not be disclosing the nature of the threat as it is the subject of an ongoing investigation."
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