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Columbine High School in Littleton, Colorado
The massacre at Columbine High School is, to this day, the deadliest high school shooting in American history. 13 people were killed and 21 were wounded. -
Lockheed Martin Plant in Meridian, Mississippi
Seven people were killed in this racially-motived shooting at the hands of a Lockheed Martin employee named Doug Michaels. Most victims were African American. -
Virginia Tech in Blacksburg, Virginia
The massacre at Virginia Tech is, to this day, the single deadliest [school shooting](http://www.nytimes.com/glogin?URI=http://www.nytimes.com/2007/04/16/us/16cnd-shooting.html&OQ=pagewantedQ3DallQ26_rQ3D0&OP=a5c44492Q2FHyJZH7AZHdddHbZgIHQ27yae,yyZ-H-UUQ60HUWH6Q3EHKeH6Q3Ea7Q27Q7EebyyZQ207F(bZgI) in history. The gunman shot 56 people and wound up killing 33 total. -
"The Dark Knight Rises" Movie Premiere in Aurora, Colorado
A gunman named James Holmes entered the premiere of "The Dark Knight Rises" at the Century 16 movie theater and killed 12 people. -
Sandy Hook Elementary School in Newtown, Connecticut
Adam Lanza took a Bushmaster AR-15 assault rifle and entered a local elementary school, taking the lives of 27 people in the process. 20 of the victims were children ages 7 or under. -
Navy Yard in Washington, D.C.
The mass shooting at a navy yard in the nation's capital left 12 people dead and 3 people injured.
