#ActiveShooter

Police: Female shooter kills self after shooting 4 at YouTube HQ Getty Images
SAN FRANCISCO

Police: Female shooter kills self after shooting 4 at YouTube HQ
Bronx hospital update: Ex-doctor shoots multiple people, kills self Bronx-Lebanon Hospital Center
NEW YORK CITY

Bronx hospital update: Ex-doctor shoots multiple people, kills self
Possible active shooter at Alabama's Redstone Arsenal WBRC
HUNTSVILLE

Possible active shooter at Alabama's Redstone Arsenal
Hospital shooting update: Police say no evidence of active shooter Ben Taub Hospital
HOUSTON

Hospital shooting update: Police say no evidence of active shooter
1 suspect dead, 9 people injured in attack at Ohio State U. John Minchillo/AP, WXIX
COLUMBUS

1 suspect dead, 9 people injured in attack at Ohio State U.
Active-shooter training evolves from lessons learned at Columbine
LAW ENFORCEMENT

Active-shooter training evolves from lessons learned at Columbine
San Bernardino shooting update: Male, female suspect killed KTLA
SAN BERNARDINO

San Bernardino shooting update: Male, female suspect killed