The Labour Party's top official says he was right not to inform parents about alleged assaults and harassment at party events.

Another young woman has come forward alleging she was sexually assaulted at a party event.

It follows reports of four 16-year-olds being allegedly groped at Young Labour summer camp at Waihi last month.

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General secretary Andrew Kirton says the party could have responded to the allegations sooner.

But he told Mike Hosking the decision not to inform the young people's parents was based on professional advice.

"We talked to professionals who deal with this day in, day out, dealing with young people, dealing with sensitive issues. That was consistent with their advice, but I understand the frustration."

LISTEN ABOVE AS ANDREW KIRTON SPEAKS WITH MIKE HOSKING