STOUGHTON (CBS) – A Stoughton High School student has been charged with threatening to attack classmates and teachers.

WBZ NewsRadio 1030′s Karen Twomey reports

Eighteen-year-old Sean Ivaldi was arrested last week, days after a teacher turned in one of Ivaldi’s notebooks to the principal. It allegedly had written threats directed towards specific students and staff members.

Police say the plan included a detailed point system – 20 points for killing students, 30 for teachers, and 60 for police officers.

Investigators say the threats were made months ago and Ivaldi did not have access to guns.

In a letter to parents, the principal said students and staff were “never in any danger.”