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An exploration of the 1999 attack at a high school in Littleton, Colo., and the myths that may have inspired the active shooter phenomenon.

Active Shooter: America Under Fire

Columbine, Colorado

A white supremacist's deadly attack on a Sikh temple in Oak Creek, Wisconsin and the heroic response by local police, transforms a community.

Oak Creek, Wisconsin

A shooter's violent path through Santa Monica, Calif., leads to a deadly confrontation on a college campus; an examination of the shooter's mental health.

Santa Monica, California

A community is left devastated and traumatized by the shooting at Pulse Nightclub.

Orlando, Florida

Stories of loss and heroism during the 2013 shooting at the Washington Navy Yard; the shooter's sister recounts her brother's descent into violence.

Washington, D.C.

The city of Charleston, South Carolina is ripped apart by a shooting at a historic church; in the aftermath, the community is divided by the idea of forgiveness.

Charleston, South Carolina

The 2015 shooting in San Bernardino, Calif. brings out a massive response from law enforcement, while a shocked community responds to homegrown terrorism.

San Bernardino, California

Survivors and first responders recount the 2012 movie theater shooting in Aurora, Colo.; a grieving family challenges the media.

Aurora, Colorado

Mass shootings through the eyes of the victims, responders and family members.

S1 E8 | Columbine, Colorado

E8 | Columbine, Colorado

E7 | Oak Creek, Wisconsin

E6 | Santa Monica, California

E5 | Orlando, Florida

E4 | Washington, D.C.

E3 | Charleston, South Carolina

E2 | San Bernardino, California

E1 | Aurora, Colorado