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Police respond to a report of an active shooter at Villanova University

590721 - DALLAS LATEST-VO

Deputies train for active shooter scenario at Glencoe High in Hillsboro

590719 - DALLAS CHIEF SOUND

Villanova University and University of Tennessee settling down after false reports of active shooter

590723 - DALLAS PROTEST SHOOTING-VO

Florida State University reports active shooter near school's student union

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Active shooter reports at Villanova University; students asked to shelter in place

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Army base in Georgia is on lockdown after report of an active shooter, spokesperson tells AP

590722 - DALLAS POLICE CHIEF SOUND-SOT

Seymour police: Active shooter taken into custody at Jackson County Public Library

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Jefferson County Sheriff's Office hosts active shooter drill

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Suspect dead after Emory Atlanta campus issues active shooter alert

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New York shooting: Shooter dead, others wounded after 'active shooter' call

590737 - Dallas Shootinf Latest

Florida State University reports active shooter near school's student union

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Active shooter at Annunciation Church in Minneapolis

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Spring ISD exceeds on active shooter safety

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Iowa high school active shooter: Officials give update

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'Active shooter' situation reported at Emory Atlanta

590727 - Hospital victim scene 6a

Officer and suspect dead in shooting near the CDC, Emory University

Multiple injured in active shooter situation at New Albany warehouse

Fort Stewart in Georgia on lockdown due to active shooter, base confirms

Active county shooter drill to take place in Jefferson County

Chicago officials give update on active shooter incident during holiday parade

HCSO starts 4-day active shooter training

Villanova University reports an active shooter on campus: Latest updates

Active shooter training courses offered in central Ohio

'Active shooter' situation reported at Emory Atlanta Campus

LIVE | At least 1 dead, 6 hospitalized after active shooter situation at FSU

How active shooter trainings could increase your chance of survival

Five hospitalized after active shooter situation at New Albany warehouse: Live coverage

Report of active shooter at Villanova apparently a hoax

What to do in an active shooter situation

Sheriff: One person possibly shot inside Katy Mills Mall in Katy, Texas | No active shooter

Is active shooter training worth it? Las Vegas shooting survivor weighs in

Licking Valley district reviews emergency plan after hoax active shooter call

The University of South Carolina was cleared after an alleged active-shooter hoax

Authorities respond to active shooter situation at warehouse in New Albany: Live Coverage

At least 1 dead, 6 hospitalized after 'active shooter' reported on FSU campus; 1 suspect in custody

Fight at Texas cheerleader competition leads to active shooter scare