The Prime Minister, parents of the victims, and police were not notified about alleged sexual misconduct at a Young Labour summer camp last month.
Four 16-year-olds were allegedly harassed or assaulted by a 20-year-old man at Young Labour's summer camp in Waihi last month, according to Newsroom.
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Labour Party general secretary Andrew Kirton told Radio New Zealand's Checkpoint he'd been advised that informing more people about the incident would traumatise the victims further.
"The advice that I've got is that it can add more distress when a wider group of people become aware of the incident...That's the advice that I've got from professional people who work in this area."
Mr Kirton told Checkpoint the victims were given the opportunity to speak to police, but it was their decision about who they told.
That's why the Labour Party did not inform the parents of the victims about the incident either.
The perpetrator has been banned from future Labour Party events, and an external review of policies and procedures is underway to prevent similar incidents in future.