The 20-year-old nursing-home employee from suburban Pittsburgh who tried to assassinate former president Donald Trump was a registered Republican who packed explosives in the vehicle he drove to the campaign rally an hour from his home.
Law enforcement officials were trying to learn more about Thomas Matthew Crooks of Bethel Park, Pennsylvania, to determine what motivated him to open fire on the rally from a nearby rooftop, killing one spectator, before he was shot dead by the Secret Service.
The FBI said on Sunday it has not yet identified any underlying ideology or threatening writing or social media posts from Crooks, who graduated from high school two years ago and had no past criminal cases against him, according to public court records. The FBI said it believes Crooks acted alone.
Trump, the presumptive Republican presidential nominee, said on social media that the upper part of his right ear was pierced in the shooting.
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Two spectators were critically injured, authorities said. The man killed was Corey Comperatore, 50, a former fire chief from the area who Pennsylvania’s governor says died a “hero” by diving on to his family to protect them.
Crooks’ father, Matthew Crooks, told CNN on Saturday that he was trying to figure out “what the hell is going on” but would not speak about his son until after he talked to law enforcement.
Crooks graduated from Bethel Park High School in 2022. In a video of the school’s graduation ceremony posted online, Crooks can be seen crossing the stage to receive his diploma, appearing slight of build and wearing glasses.
Crooks tried to get into the school’s rifle team but was turned away because he was a bad shot, said Frederick Mach, a current captain of the team who was a few years behind Crooks at the school.
Jason Kohler, who said he attended the same high school as Crooks, said Crooks was bullied at school and sat alone at lunch time.
Other students mocked him for the clothes he wore, which included hunting outfits, Kohler said.
“He was bullied almost every day,” Kohler told reporters. “He was just a outcast, and you know how kids are nowadays.”
Crooks worked at a nursing home as a dietary aide, a job that generally involves food preparation.
Marcie Grimm, the administrator of Bethel Park Skilled Nursing and Rehabilitation, said in a statement she was “shocked and saddened to learn of his involvement”.
Ms Grimm added that Crooks had a clean background check when he was hired.
Crooks’ political leanings were not immediately clear. Records show Crooks was registered as a Republican voter in Pennsylvania, but federal campaign finance reports also show he gave money to a progressive political action committee on January 20, 2021, the day President Joe Biden was sworn into office.
Butler County district attorney Richard Goldinger told AP on Sunday that Crooks had been previously unknown to investigators in his county and had not been on their radar. He said the investigation had so far not turned up any evidence that he had co-ordinated with anyone else in the region.
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Bomb-making materials were found inside Crooks’ vehicle near the Trump rally and at his home, according to two officials. A white Allegheny County Police truck identified as bomb squad pulled up to the home on Sunday.
Crooks used an AR-style rifle, which authorities said they believe was purchased by his father.
Kevin Rojek, FBI special agent in charge in Pittsburgh, said that investigators do not yet know if he took the gun without his father’s permission.
One local police officer climbed to the roof and encountered Crooks, who pointed his rifle at the officer.
The officer retreated down the ladder and Crooks quickly took a shot at Trump, and that is when Secret Service snipers shot him, said the officials.
The roof where Crooks lay was less than 150 metres from where Trump was speaking, a distance from which a decent marksman could reasonably hit a human-sized target.