Parents and children have been warned to be more vigilant when using social media sites after a 12-year-old boy from Christchurch was allegedly threatened by an unknown Facebook user.
The boy's mother complained to the police in Canterbury that her son was asked to send naked photos of himself to an unknown Facebook user who had added him as a friend.
When the boy refused to send photos, the Facebook user responded in a threatening manner, police were told.
Constable Mike Kneebone said police knew of at least one other boy, outside Canterbury, who had been approached by the same user.
"We ask anyone else who has been approached in a similar way to contact us as their information may provide information that is vital to this ongoing investigation."