The Federal Bureau of Investigation (FBI) has identified 20-year-old Thomas Matthew Crooks from Bethel Park, Pennsylvania, as the suspect involved in the attempted assassination of former US President Donald Trump during a campaign rally on Saturday. The suspect was reportedly shot and killed by the Secret Service moments after allegedly firing shots towards the stage where Trump was speaking in Butler, Pennsylvania. The FBI is currently investigating the motive behind the attack, which resulted in one rally attendee's death and left two other spectators critically injured. Trump sustained a gunshot wound to the ear. According to state voter records, Crooks was a registered Republican, and the upcoming November 5 election would have marked his first opportunity to vote in a presidential race. Crooks resided approximately an hour away from the shooting location in Butler. The Federal Aviation Administration announced on Sunday that it had closed the airspace over Bethel Park for "special security reasons." At the age of 17, Crooks made a $15 donation to ActBlue, a political action committee supporting left-leaning and Democratic politicians, as per a 2021 Federal Election Commission filing. The donation was designated for the Progressive Turnout Project, a national organization encouraging Democrats to vote. Neither group has responded to a request for comment from Reuters. Crooks' father, Matthew Crooks, 53, expressed to CNN that he was attempting to understand the situation and would wait to speak with law enforcement before discussing his son. Thomas Crooks graduated from Bethel Park High School in 2022, as reported by the Pittsburgh Tribune-Review. He was awarded a $500 "star award" from the National Math and Science Initiative, according to the newspaper. A 2022 graduation ceremony video referenced by the New York Times shows Crooks receiving his high school diploma amidst applause. The online video depicts Crooks wearing glasses and a black graduation gown, posing with a school official. Reuters has not yet verified the authenticity of the video. Law enforcement officials stated on Saturday that Crooks did not carry any identification to the shooting site and was identified through alternative methods. "We are currently examining photographs and attempting to obtain biometric confirmation through his DNA," said Kevin Rojek, FBI special agent in charge, during a press briefing. USA Today reported that numerous law enforcement vehicles were stationed outside a residence listed as Crooks' voter registration address. Agents from the Bureau of Alcohol, Tobacco, Firearms and Explosives were present at the scene, along with a bomb squad, as reported by USA Today. The perimeter of the suspect's residence was secured with yellow police caution tape on Sunday, with an Alleghany County Police vehicle parked outside. "It's madness that anyone would commit such an act," commented Dan Maloney, a 30-year-old local resident, as quoted by USA Today. Reuters has been unable to identify any social media accounts or online postings by Crooks. Meta, the parent company of Facebook and Instagram, has not yet responded to inquiries regarding the removal of any accounts associated with the suspect.