Law enforcement authorities have identified the man who made an assassination attempt on former President Donald Trump at a rally in Pennsylvania on Saturday.

The FBI said the shooter, who is dead, was identified as 20-year-old Thomas Matthew Crooks of Bethel Park, Pennsylvania. A motive was not clear.

The gunman was immediately “neutralized” by the Secret Service, chief of communications Anthony Guglielmi said.

Bethel Park is a predominantly white, relatively well-to-do city in the southern reaches of greater Pittsburgh. The site of the rally, Butler, is about an hour’s drive north of Pittsburgh.

Pennsylvania voter records listed a Thomas Matthew Crooks with the same address and birth date as a registered Republican, though it was not clear from the records when that was put in place.

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At a news conference Saturday night, law enforcement said the investigation was close to making a positive identification of the shooter, who did not have identification on him, state police Lt. Col. George Bivens said.

"The shooter has been tentatively identified," he said. "It’s a matter of doing biometric confirmations."

Investigators have also prioritized finding a motive and determining whether the shooter had accomplices, authorities said at the news conference.