Unnamed girl was targeted by threatening posts on social media . Was taken home from Lone Hills High School in San Dimas , California . Investigators believe fellow users are behind the threats . In one instance a user tries to bring a knife to school and stab the victim .
Unnamed girl was targeted by threatening posts on social network . Was taken home from Lone Hills Middle School in San Dimas , California . Investigators believe fellow students are posting the threats . In one message a user threatens to bring a knife to school and stab the girl .