GROVELAND, Mass. (WHDH) — A Groveland teen has been arrested for allegedly making a threat against Pentucket Regional High School.

Police said the 17-year-old was arrested at his home just before 9 p.m. and was charged with communicating a threat to a public school.

Shortly after 7 p.m. Tuesday, another juvenile entered the West Newbury Police Department and reported they had seen a post on Instagram allegedly depicting the suspect referencing the first day of school and showing what appeared to be a firearm tucked into his waistband.

Police determined the firearm was actually an Airsoft pistol, which is considered a firearm for the purpose of school building threats.

The suspect is being held without bail and will be arraigned Wednesday in Lawrence Juvenile Court.

The high school will open for the first day of school on Wednesday as scheduled.

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