Following the assassination attempt, the FBI, Secret Service, and Pennsylvania State Police initiated a comprehensive investigation, classifying the incident as an act of domestic terrorism.
Forensic teams collected evidence at the scene, focusing on the AR-15-style rifle used and surveillance footage of Crooks' movements prior to the incident.
Items recovered from Crooks car included a bulletproof vest, loaded magazines, and remote-controlled explosive devices. An additional search of his home uncovered another bulletproof vest, another remote-controlled explosive device and a 3D printer.
Records indicated that Crooks had practiced shooting the day before the incident and purchased ammunition on the day of the attack. The investigation expanded to include Crooks' cellphone and computer, and over 100 interviews were conducted to collect information and eyewitness accounts, including from Trump himself.
Crooks' digital activity showed searches related to political figures and historical assassinations, including “How far away was Oswald from Kennedy?”Authorities issued a public appeal for any additional information or video footage.
A bipartisan House task force consisting of seven Republicans and six Democrats was established to investigate the security lapses and scrutinize the Secret Service's actions to identify areas needing improvement.
Further to these efforts, Homeland Security Secretary Alejandro Mayorkas appointed a bipartisan panel to conduct a thorough examination of security protocols.
Additionally, President Joe Biden ordered an independent review of the incident to ensure a comprehensive assessment. Preliminary findings suggested Crooks acted alone with no evidence of ties to larger conspiracies.
The investigation continues to probe Crooks' background for potential motives and any prior criminal activity, with no definitive motive established yet.