<Tr> <Th> Non-fatal injuries </Th> <Td> </Td> </Tr> <Tr> <Th> Perpetrator </Th> <Td> Adam Lanza </Td> </Tr> <P> The Sandy Hook Elementary School shooting occurred on December 14, 2012, in Newtown, Connecticut, United States, when 20 - year - old Adam Lanza fatally shot 20 children between six and seven years old, as well as six adult staff members . Prior to driving to the school, he shot and killed his mother at their Newtown home . As first responders arrived at the scene, Lanza committed suicide by shooting himself in the head . </P> <P> The incident was the deadliest mass shooting at either a high school or grade school in U.S. history and the fourth - deadliest mass shooting by a single person in U.S. history . The shooting prompted renewed debate about gun control in the United States, including proposals for making the background - check system universal, and for new federal and state gun legislation banning the sale and manufacture of certain types of semi-automatic firearms and magazines with more than ten rounds of ammunition . </P>

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