On the heels of an attempt to kill him, former President Donald Trump called Sunday for unity and resilience as shocked leaders across the political divide recoiled from the shooting that left him wounded but “fine.”

A former fire chief attending the rally with family was killed, as was the gunman. Two other people were also critically wounded.

The presumptive Republican presidential nominee said the upper part of his right ear was pierced in the shooting. His aides said he was in “great spirits” and doing well.

“I knew immediately that something was wrong in that I heard a whizzing sound, shots, and immediately felt the bullet ripping through the skin,” he wrote on his social media site. “Much bleeding took place.”

In a subsequent social post Sunday, Trump said “it was God alone who prevented the unthinkable from happening.”

“In this moment, it is more important than ever that we stand United, and show our True Character as Americans, remaining Strong and Determined, and not allowing Evil to Win,” his post said.

Pennsylvania Gov. Josh Shapiro on Sunday identified the rallygoer who was killed as Corey Comperatore, a former fire chief from the area, and said he “died a hero.”

“His wife shared with me that he dove on his family to protect them,” Shapiro said. He declined to discuss the condition of two others who were wounded.

The FBI identified the shooter as Thomas Matthew Crooks, 20, of Bethel Park, Pennsylvania, which is about 50 miles from the scene of the shooting. An FBI official said investigators had not yet determined a motive.

Secret Service agents fatally shot Crooks. The gunman attacked from an elevated position outside the rally venue at a farm show in Butler, the agency said. The community is about 30 miles north of Pittsburgh.

Law enforcement officials told The Associated Press that bomb–making materials were found inside the vehicle of the man suspected in the Trump rally shooting. There were also bomb–making materials found at his home. The two officials were not authorized to publicly discuss details of the investigation and spoke to the AP on condition of anonymity.

Investigators believe the weapon Crooks used was purchased by his father at least six months ago, the law enforcement officials said. Federal agents were still working to understand when and how his son obtained the gun and to gather additional information about Crooks, according to the officials.

Crooks’ political leanings were not immediately clear. Records show Crooks was registered as a Republican voter in Pennsylvania, but federal campaign finance reports also show he gave $15 to a progressive political action committee on Jan. 20, 2021, the day President Joe Biden was sworn in to office.

Authorities told reporters that Crooks was not carrying identification so they were using DNA and other methods to confirm his identity. Law enforcement recovered an AR–style rifle at the scene, according to a person familiar with the matter who spoke on condition of anonymity to discuss the investigation.