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Secret Service: Majority of mass attack culprits sent warning signs

Credit: AP/John Locher

Secret Service: Majority of mass attack culprits sent warning signs

VA. first responders train for mass casualty events

VA. first responders train for mass casualty events

More mass casualty

Secret Service: Majority of mass attack culprits sent warning signs

Secret Service: Majority of mass attack culprits sent warning signs

VA. first responders train for mass casualty events

VA. first responders train for mass casualty events

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