Before the FBI announcement, Pennsylvania State Police Lt. Col. George Bivens said the attacker opened fire roughly 10 to 15 minutes after Trump took the stage at the Butler Farm Show Grounds in Pennsylvania, grazing his ear before Secret Service agents surrounded the former president and escorted him off the stage.
One victim died at the scene and two more are critically wounded, Bivens added.
“Law enforcement acted heroically,” he said, noting that they worked “quickly” to “neutralize the threat.”
Law enforcement said they are still investigating a motive.
Bivens also declined to specify what weapon the shooter used, though eyewitnesses have described seeing a man crawling across a roof holding a rifle.
The FBI also deflected questions from reporters about security measures taken by the U.S. Secret Service to secure the area before the rally began. Bivens said the shooter fired from a rooftop outside of that perimeter but declined to give more specifics.