The student, who is a minor, was removed from school May 10 after fellow students reported the threats to school administrators. The student underwent a psychiatric evaluation after the district suspended him.
Police Chief Leo McCarthy said the student was an upperclassman in the district with no prior criminal history. He described the student and his parents as cooperative during an investigation, which included a police search of his home.
McCarthy declined to discuss the specific nature of the threats but said they included printed and electronic material.
The student also is charged with tampering with or fabricating physical evidence and possessing instruments of crime, said McCarthy. The student had a pretrial conference Tuesday.
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