Survivors and first responders recount the 2012 movie theater shooting in Aurora, Colorado.
The 2015 shooting in San Bernardino brings out a huge response from law enforcement.
The city of Charleston, South Carolina is ripped apart by a shooting at a historic church.
Stories of loss and heroism during the 2013 shooting at the Washington Navy Yard.
Pulse Nightclub in Orlando, Florida is attacked by a shooter who kills 49 people.
A shooter’s violent path through Santa Monica leads to a deadly confrontation on a college campus.
A white supremacist’s deadly attack on a Sikh temple in Oak Creek, Wisconsin and the heroic response by local police transforms a community.
An exploration of the attack at a high school in Littleton, Colorado, and the myths that may have inspired the active shooter phenomenon.