PEPPERELL, MASS. (WHDH) - A high school student from Pepperell was arrested after officials say he made an Instagram threat against North Middlesex Regional High School on Tuesday.

The student, Sanjay Daley, 18, was charged with threats of dangerous items. He is accused of posting a plan to harm students on the first day of school, which was Wednesday.

Police investigated and determined the account belonged to Daley. He was arrested at his home Tuesday night.

Police also contacted the Northeastern Massachusetts Law Enforcement Council’s School Threat Assessment Response Team. Officers were stationed at the school Wednesday, and all students passed through metal detectors.

Daley was arraigned in Ayer District Court Wednesday morning.

Police say they are still investigating.

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