Students at Sandy Hook Elementary School were sent home Friday after a bomb threat on the sixth anniversary of a massacre that killed 20 first-graders and six educators.
Newtown police said the threat was called in about 9 a.m., and the school was evacuated, reported NECN.
Police said the threat was not believed to be credible, but they said it would be taken seriously and fully investigated.
Two other threats were also made Thursday in Newtown, according to police.
The school building where the children and educators were gunned down Dec. 14, 2012, was demolished and a new school built on the same site.
The victims' families have been targeted for harassment over the years by conspiracy theorists who believe the shooting was faked.