Police have responded to the campus of the high school and middle school in North Haven after a threat.
Police said school staff issued a shelter-in-place after being notified of concerning comments of a threat of violence at the school.
Authorities said they received a complaint that revolved around a witness who claimed they overheard a high school make a call asking a person to come to the school, possibly with a firearm.
Because of this, staff at the school activated a shelter in place until the police department arrived and investigated.
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There is no threat to students or staff. The investigation remains ongoing.