WATCH LIVE: NBC's TV coverage of the deadly Connecticut school shootings
A massacre at Sandy Hook Elementary School in Newtown, Conn., has reportedly left dozens of people dead, including many children
A gunman allegedly opened fire at Sandy Hook Elementary School in Newtown, Conn., on Friday morning, leaving more than two dozen people dead — many of them children. As one of the largest school tragedies in U.S. history unfolds, read our coverage culled from social media, or watch NBC's live coverage below for the latest news and updates.
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