Police: Female shooter kills self after shooting 4 at YouTube HQ
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
Ben Taub Hospital
Hospital shooting update: Police say no evidence of active shooter
John Minchillo/AP, WXIX
1 suspect dead, 9 people injured in attack at Ohio State U.
Active-shooter training evolves from lessons learned at Columbine
San Bernardino shooting update: Male, female suspect killed
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