Deadliest U.S. shootings

A shooting at an elementary school in Newtown, Conn. on Friday morning killed 27 people, including 20 children, law enforcement sources said. The shooting is the second deadliest in U.S. history. Related article

CORRECTION: An earlier version of this graphic incorrectly reported that Lanza used two pistols and a shotgun, instead of two pistols and a rifle, in the Sandy Hook shooting.

SOURCE: Associated Press and other news reports, Violence Policy Center, Brady Campaign to Prevent Gun Violence, Law Center to Prevent Gun Violence.

GRAPHIC: Bonnie Berkowitz, Alberto Cuadra, Cristina Rivero, Laura Stanton and Sisi Wei - The Washington Post. Published July 20, 2012. Updated Dec. 14, 2012.

Note: Several of these gunmen killed other people in the hours or days preceeding their mass shootings.