The shooter in the 2012 Sandy Hook Elementary School massacre “did not snap” and had methodically planned the attack from as early as March 2011, according to newly released Federal Bureau of Investigation documents.

The FBI on Tuesday released hundreds of pages of documents related to the criminal investigation, providing new insight into the weeks leading up to the Dec. 14, 2012, attack in which 20-year-old Adam Lanza, of Newtown, Conn., killed 20 children and six adults.


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