The 911 tapes were released after a Superior Court judge denied an attempt by Danbury State's Attorney Stephen Sedensky to keep them sealed.
The Dec. 14, 2012, calls describing shots being fire and the school being on lockdown came from a school secretary, teachers and a janitor the Courant said.
The 911 calls placed to Troop L in Litchfield remain in State Police custody.
Read the full story here at Courant.com.
A report from the prosecutor that found the shooter, Adam Lanza, acted alone was released last week. Read about it here at The Daily Voice.
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