A group of secondary school boys have been assaulting young women in broad daylight and posting videos to social media.
New Zealand Secondary Principals' Association executive member Patrick Walsh - chairman of a high-powered Government group to counter cyber bullying among school students - said the boys would film themselves slapping young women on the bottom.
The boys were caught when a shopper who witnessed them in action, recognised their uniforms and reported it to the school.
They were identified and confessed to school bosses.
"Teen boys would jump out of a car and approach young women and smack them on the bottom," Walsh said.