NEWTOWN, CT - DECEMBER 24:  Claud Oliveira holds his son, Jeremiah Oliveira, while lighting a candle at a memorial for those killed in the school shooting at Sandy Hook Elementary School on December 24, 2012 in Newtown, Connecticut. Donations and letters are pouring in from across the country as the town tries to recover from the massacre. (Photo by Andrew Burton/Getty Images)

Sandy Hook School Shooting

On December 14, 2012, one of America's most tragic incidents of gun violence took place. A lone gunman, 20-year-old Adam Lanza, broke into Sandy Hook Elementary School in Newtown, Connecticut and murdered 26 people, including 20 children, before killing himself. It is the second deadliest school shooting in the United States. The tragedy reignited the nation's long-standing debate over gun control and a ban on assault weapons.

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