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Sandy Hook school shooting

Associated Press
Mourners grieve at one of the makeshift memorials for victims of the Sandy Hook Elementary School shooting, Sunday, Dec. 16, 2012, in Newtown, Conn. On Friday, a gunman allegedly killed his mother at their home and then opened fire inside the school, killing 26 people, including 20 children. (AP Photo/Mary Altaffer)

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A man opened fire Dec. 14, 2012, inside the Sandy Hook, Connecticut elementary school where his mother worked as a teacher, killing 26 people, including 20 children, as youngsters cowered in their classrooms and trembled helplessly to the sound of gunfire reverberating through the building.

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