State police issued a warning on Thursday to remind people that falsely reporting incidents like school threats will have serious repercussions.
Troopers said the most recent incident of "swatting" happened at A.I. Prince Technical High School in Hartford on June 9.
A 17-year-old student was arrested and charged in the case.
In 2013, another incident shut down the Yale University campus. State police said it pulled resources away from other service calls.
Troopers said cases like that have the potential to lead to disasters in addition to being disruptive and unsettling.
They said there are more important things than a prank to which first-responders need to be responding.
State police said they take all potential threat reports seriously and must treat calls as if they are genuine.
Anyone who calls in a fake one can face criminal charges.
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State police said they made an arrest following last week's threat at a technical school in Hartford.