Nation Mourns Connecticut Victims

By Bloomberg Photos - 2012-12-17T19:16:55Z

Photograph by David Goldman/AP Photo

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Main Street, Newtown

The man authorities say killed 27 people in Connecticut was a reserved and intelligent 20-year-old who suffered from a mental disability, police and people who knew him said.

Adam Lanza committed the second-worst mass shooting in U.S. history, killing 20 children, six adults and himself after he walked into Sandy Hook Elementary School in Newtown and opened fire, according to two law-enforcement officials briefed on the matter. His mother, Nancy, was found dead at their home, according to the officers, who asked for anonymity because the investigation is continuing.

Left, a U.S. flag flies at half-staff on Main Street in memory of the people killed during the Newton school shooting, in Newton, Conn., on Dec. 15, 2012.

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