Newtown police say the threat was made at about 9 a.m. Friday and the school was evacuated. Lt. Aaron Bahamonde says there's a heightened level of anxiety in town on the anniversary and the school superintendent decided to cancel remaining classes.
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It's unclear whether the threat was related to the bomb threats made nationwide Thursday.
The school where the shooting happened on Dec. 14, 2012, was knocked down and a new building was constructed at the same site.
Moments of silence were observed in Newtown and other places Friday morning in memory of the victims.
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