Donald Trump was the target of an apparent assassination attempt Sunday in Florida, the FBI said, with the Republican presidential candidate's campaign and law enforcement reporting he was safe and unharmed.

The U.S. Secret Service confirmed one or more of its agents "opened fire on a gunman" located near the boundary of Trump's golf course and that an "AK-47 style rifle" with a scope was recovered along with a GoPro video camera.

Amid the confrontation with the Secret Service, the suspect bolted out of the shrubbery he had been hiding in and escaped in a black car. A witness helped police identify the vehicle and authorities tracked it down.

"We have somebody in custody right now that is a potential suspect," Palm Beach County Sheriff Ric Bradshaw told a news conference.

U.S. media named the suspect as Ryan Wesley Routh, 58, who had expressed support for Ukraine. Agence France-Presse (AFP) interviewed him in 2022 in Kyiv, where he had traveled to support the war effort.

Trump had been playing golf at his course in West Palm Beach, Florida, not far from his Mar-a-Lago residence, when the would-be shooter was spotted in bushes one hole ahead of the former president, Bradshaw said.

"President Trump is safe following gunshots in his vicinity," his campaign spokesperson Steven Cheung said in a statement, while Democratic presidential hopeful Kamala Harris expressed relief her political rival was out of danger.

Trump himself said in a fundraising message on his website: "Fear not! I am safe and well, and no one was hurt. Thank God!"

He later thanked the Secret Service, Sheriff Bradshaw and law enforcement for "the incredible job done today" in keeping him safe.

"I would like to thank everyone for your concern and well wishes – It was an interesting day!" Trump posted late Sunday on his Truth Social platform.

The unnerving incident appears to mark the second time in as many months that Trump has been the target of an assassination attempt. The former president was wounded in the ear on July 13 as he addressed an outdoor rally in Butler, Pennsylvania.

Authorities who addressed Sunday's news conference did not confirm whether a gunman actually fired a weapon in the direction of the former president but said the Secret Service fired shots.

"We are not sure right now if the individual was able to take a shot at our agents," said Rafael Barros of the Secret Service.

The Federal Bureau of Investigation said it is "investigating what appears to be an attempted assassination of former President Trump."

Officials praised the quick action of the Secret Service, an agency that has been under intense scrutiny since its apparent failure to detect and stop a gunman from shooting at Trump in Pennsylvania.

Sheriff Bradshaw said Secret Service personnel in Trump's protective detail spotted "this rifle barrel sticking out of the fence and immediately engaged that individual, at which time the individual took off."

He estimated the suspect was set up 300 to 500 yards (275 to 455 meters) away, but "with a rifle and a scope like that, that's not a long distance."

'In good spirits'

The incident came amid heightened tensions in the knife-edge presidential race and concern for the safety of both candidates.

"There is no place for political violence or any violence ever in our country," President Joe Biden said in a statement.

"I have directed my team to continue to ensure that the Secret Service has every resource, capability, and protective measure necessary to ensure the former president's continued safety."

Vice President Harris took to social media to say: "I am glad he is safe."

Several Trump supporters and members of his inner circle, including his running mate J.D. Vance, offered their support and gratitude that tragedy was avoided.

"I'm glad President Trump is safe," Vance said on X. "I spoke to him before the news was public and he was, amazingly, in good spirits."

The Secret Service, tasked with protecting presidents, former presidents and other dignitaries, has faced criticism since the Pennsylvania shooting.

Kimberly Cheatle, the head of the agency, resigned amid the ensuing scrutiny, and at least five agents were placed on administrative leave.

Representative Elise Stefanik, the fourth-ranking U.S. House Republican, thanked law enforcement for their actions Sunday but raised questions about the latest incident.

"We must ask ourselves how an assassin was allowed to get this close to President Trump again," she said in a statement.

"There continues to be a lack of answers for the horrific assassination attempt in Pennsylvania and we expect there to be a clear explanation of what happened today in Florida."