JUST IN: Explosive devices found in car of would-be Trump assassin Thomas Matthew Crooks: report

Sources involved in the investigation revealed to the Wall Street Journal that Crooks' car, discovered parked near the rally site in Butler, Pennsylvania, contained explosives. Authorities were alerted to the presence of suspicious packages in the area where Crooks had positioned himself, prompting the dispatch of bomb technicians. Inevistagtors remained at the scene late into the night to ensure that the area was clear of any explosive devices.

In addition to finding explosives in his car, a neighbor of Crook's was informed by a bomb squad that explosives were found in Crook's home, according to the New York Post. Law enforcement officials who spoke to the Associated Press confirmed that bomb-making materials were found inside the home.

The assassination attempt occurred when Crooks fired multiple rounds from a rifle from a rooftop near the rally. He was subsequently killed by Secret Service counter-snipers. The rifle used in the attack was reportedly purchased by his father at least six months ago, the Wall Street Journal also reported.

Authorities continue to investigate the incident, seeking to understand Crooks’ motive behind the assassination attempt of the former president. The FBI has stated that the situation remains an "active and ongoing investigation," and has asked anyone with information to submit photos or videos online at fbi.gov/butler or call 1-800-CALL-FBI.