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Grievances and belief in conspiracy theories motivate many mass attacks, Secret Service report says

05:25

The National Threat Assessment Center at the Secret Service has released research that looks at 173 mass attacks from 2016 to 2020 and the various trends among them including radical ideologies and personal grievances. NBC News' Julia Ainsley reports on the details of the report and what potential behavior or motives could be warning signs of these attacks.