Police in Colchester said they arrested a suspect who implied a high school in town would be the target of an active shooter.
Nicholas Burtis, 18, was taken into custody on Tuesday through an arrest warrant.
The threat was posted on the social media app Instagram and referenced Bacon Academy, according to police.
The school resource officer was notified of the threat and arrest.
Police began investigating on Monday.
Officers said they were able to identify possible suspects and obtained a confession from Burtis, a former student who stated he had posted the comment as a prank.
The suspect does not own or have access to any known firearms, police said.
State police said he faces a second-degree breach of peace charge.
Burtis could not post a $5,000 bond and was transported directly to court in Norwich on Tuesday.
School leaders sent a letter to parents on Wednesday that said in part "The recent school shooting incident in Parkland, Florida, as well as not too distant school shooting incident at Sandy Hook Elementary School right here in Connecticut, remind us of our number one priority as a school community and that is the health and safety of our students. I ask that you continue to be patient as we engage in our strict school visitor procedures; they are in place for the safety of all."
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