Video clips allegedly show 20-year-old Thomas Crooks dry-firing a handgun in his bedroom days before he shot President Trump in the ear at a Butler, PA rally. Investigators say Crooks’s online footprint revealed an obsession with mass shootings, assassinations and explosives; some clips were later scraped from social platforms. The FBI is probing the case as markets and security officials assess threats to public figures and the risks of online radicalization.

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