A Facebook threat posted by a Canterbury teenager that sparked an international police response has highlighted the serious effects of cyber bullying on young people, say experts.
The 16-year-old Rangiora High School student posted a comment on his Facebook page on Thursday saying he had been bullied and would "go to school and shoot everyone in sight".
A woman in North Carolina alerted United States authorities after her stepson saw the message.
Police in the US quickly responded to the threat, which said the boy lived in "Mt Heaven, Texas" - similar to the town of Mt Haven in the same state - and contacted the school principal.
The New Zealand boy had since confessed that the comment was a joke in response to Facebook bullying he had suffered, said school principal Peggy Burrows. Although the incident had been embarrassing for the school it had also drawn attention to the "unprecedented" level of cyber bullying and its effects, she said.