Overview

• Thomas Matthew Crooks displayed severe mental health deterioration before July 2024, including talking to himself and exhibiting possible hallucinations while researching depression online.
• He covertly purchased bomb-making components such as nitromethane through aliases and encrypted networks in the months leading up to the rally attack.
• Investigators uncovered that Crooks conducted extensive online research into President Trump, former President Joe Biden, historical assassinations and firearms.
• A homemade bomb was discovered in Crooks’s childhood home after the shooting, though it did not detonate.
• Secret Service and FBI procedures are under review after security lapses allowed Crooks to approach and fire at President Trump during the Butler, Pennsylvania rally.