In December 2012, a gunman walked into Sandy Hook Elementary School in Newtown, Connecticut, and killed 20 children, six adults, and himself. Since then, there have been at least 1,069 mass shootings, with at least 1,206 people killed and 4,226 woundIn December 2012, a gunman walked into Sandy Hook Elementary School in Newtown, Connecticut, and killed 20 children, six adults, and himself. Since then, there have been at least 1,399 mass shootings, with at least 1,564 people killed and 5,515 wounded.