The FBI and state law enforcement officials have “provisionally identified” a person as the gunman who attempted to assassinate former President Donald Trump at a rally outside Pittsburgh on Saturday.

“There were some complexities that slowed down some of the processing” and identification of the perpetrator, according to Pennsylvania State Police Lt. Col. George Bivens. He spoke during a press conference Saturday night, along with an FBI spokesman.

The FBI confirmed that it had no information about the threat prior to the incident.

Minutes into Trump’s speech at the rally in Butler, Pennsylvania, loud noises were heard and people bowed. Trump was seen clutching his face or ear and falling to the ground. When he stood back up, surrounded by Secret Service officers, blood was running down his face.

“It was a chaotic scene,” Bivens said. “Law enforcement, I believe, acted heroically.”

Trump was taken to nearby Butler Memorial Hospital.

A video showed Trump’s motorcade leaving the hospital around 9:10 p.m. Trump left Butler shortly after, according to a statement from Pennsylvania Gov. Josh Shapiro.

Bivens said law enforcement was “responding to verify several” accounts of “suspicious” activity at the scene. Bivens said 30 to 40 officers from the Pennsylvania State Police were at the rally.

Officials said they have identified a single suspect, but were unwilling to positively identify the person, only that he was male.

“We’re close to that identification,” FBI Special Agent in Charge Kevin Rojack said at a press conference Saturday night. There is no known motive, Rojek said.

Rozek said the team “doesn’t take it for granted that this was a lone wolf attack,” but did not provide additional details.

Bivens said there is “no further threat” to the public.

“It’s still an active crime scene,” Rojek said. “We are reviewing all investigative leads.”

In addition to the shooter, a male participant in the rally was also killed. Two other male adults were seriously injured, according to Bivens.

An ER doctor told CBS News that he thought the sounds “were firecrackers” but then heard someone yell “they shot him, they shot him.”

“The guy had turned around and was jammed between the stalls,” the doctor said. “He was shot in the head here. There was a lot of blood and he had brain matter.”

The shooting is officially being investigated as attempted murder. The investigation will continue in the coming “days, weeks and months,” according to Rojek. Trump is expected in Milwaukee next week for the Republican National Convention, where he will formally nominate for president.

Anyone with information that can help the FBI is asked to call the tip line at 1-800-CALL-FBI (1-800-225-5324). Information can also be sent to fbi.gov/butler.

Rozek said the videos and photos are useful, as well as information about the shooter once his identity is revealed.

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