Gun control is political. So is REFUSING to address the politics of gun violence. Mass shootings since Sandy Hook, in one map updated on August 26, 2015 .. 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 887 mass shootings, with shooters killing at least 1,148 people and wounding 3,184 more.