Thomas Matthew Crooks, the 20-year-old man who attempted to assassinate Donald Trump at a rally in Butler, Pennsylvania, had searched online for information on previous mass shootings, major depressive disorder, and public figures like Trump and President Biden. Investigators recovered rudimentary explosive devices from his car and found photos of multiple political figures on his phone. Despite extensive searches of Crooks' devices and over 200 interviews, no clear ideological motive has been identified, and the FBI is investigating the act as potential domestic terrorism. Crooks, who was a registered Republican, did not leave any manifestos or writings to explain his actions. One person was killed and two others were seriously wounded in the attack, while Trump sustained a minor ear injury.