Trump shooting updates: Shooter flew drone near site hours before shooting

Authorities believe they have an identification on the suspected shooter, but are not yet releasing a name "as it is a very sensitive point in the investigation," according to a law enforcement source.

Early indication is that this is a lone wolf, the source said, but the situation is fluid and the investigators want to be absolutely certain that this person had no support and that no one knew what was coming.

The gunman opened fire with a rifle from the roof of a building about 200 to 300 yards away from the stage where Trump was speaking. A U.S. Secret Service counter-sniper team immediately killed the individual.

Trump left the Butler, Pennsylvania, area just after 11 p.m., according to Gov. Josh Shapiro.

"Under the protection of US Secret Service and with the assistance of the Pennsylvania State Police, former President Trump has now left the Butler area," Shapiro said. "Lori and I are thankful that his team reports that he is fine and we continue to wish him a full and speedy recovery."

The former president left the area about five hours after the shooting took place.

Trump's plane took off from Pittsburgh, but a destination was not released.

President Biden spoke with Trump, a White House official told ABC News.

Biden also spoke with Pennsylvania Gov. Josh Shapiro and Butler Mayor Bob Dandoy, the official said.

-ABC News' Mary Bruce

The suspected shooter was a man and was killed by a Secret Service counter-sniper, according to a source familiar with the investigation.

His identity hasn't been immediately confirmed.

FBI Director Christopher Wray briefed Biden and the national security adviser Jake Sullivan, according to the source.

-ABC News' Pierre Thomas