"The Secret Service has implemented protective measures and former presidents are safe," said Secret Service spokesperson Anthony Guglielmi. According to Liputan6.com, the Butler County district attorney confirmed to KDKA-TV CBS Pittsburgh that two people died in this incident, namely an armed man and a spectator. Two law enforcement sources confirmed to CBS News that the armed man was male, but his identity has not been released yet.""

After this incident, Donald Trump briefly wrote his response on social media. "Most importantly, I want to express my condolences to the families of the people killed in the public meeting, and also to the families of those severely injured. It is truly extraordinary that such an act of (shooting) can happen in our country. Currently, nothing is known about the shooter, who is now deceased," Trump said in a social media post.

A eyewitness who attended Donald Trump's campaign in Pennsylvania named Greg told BBC that he saw a man on top of a building located several hundred meters from the location. "He was carrying a rifle, we could clearly see him carrying a rifle," said Greg. Greg also mentioned that he pointed out the man's presence to the police.

According to the authorities, the perpetrator fired shots from a distance of hundreds of meters using an AR-type rifle. The authorities also suspect that the perpetrator is a sharpshooter or sniper. Butler County District Attorney Richard Goldinger said that he was informed by his chief detective about the characteristics of the shooter. "To do that, a rifle and a distance of hundreds of meters are required," said Goldinger.