Acting Special Agent in Charge of the St Louis FBI Office David Herr joins Megan and Tom with details.  He says people shouldn't hesitate to report concerns about individuals to authorities.   Credit: © Kelly Wilkinson/IndyStar / USA TODAY NETWOR

Acting Special Agent in Charge of the St Louis FBI Office David Herr joins Megan and Tom with details. He says people shouldn't hesitate to report concerns about individuals to authorities. Credit: © Kelly Wilkinson/IndyStar / USA TODAY NETWOR

Acting Special Agent in Charge of the St Louis FBI Office David Herr joins Megan and Tom with details.&nbsp; He says people shouldn't hesitate to report concerns about individuals to authorities. &nbsp; Credit: © Kelly Wilkinson/IndyStar / USA TODAY NETWOR

FBI launches new campaign to prevent mass violence events

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FBI launches new campaign to prevent mass violence events

FBI launches new campaign to prevent mass violence events