Authorities say Adam Lanza killed his mother at their home and then opened fire inside the Sandy Hook Elementary School in Newtown, Conn., killing 26 people, including 20 children, before taking his own life, on Friday, Dec. 14, 2012. (AP Photo/NBC News)

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Authorities say Adam Lanza killed his mother at their home and then opened fire inside the Sandy Hook Elementary School in Newtown, Conn., killing 26 people, including 20 children, before taking his own life, on Friday, Dec. 14, 2012. (AP Photo/NBC News)