Officer attempted to stop suspect in Trump assassination attempt: County sheriff
A local sheriff has confirmed to ABC News that an officer tried to stop the suspect moments before shots were fired.

One spectator was killed and two were critically hurt in Saturday's shooting.
Federal authorities are investigating after former President Donald Trump was shot in the ear in an assassination attempt at an election rally in Butler, Pennsylvania, on Saturday.
Blood splattered on Trump's face as Secret Service agents surrounded him and led him off the stage to a waiting vehicle to whisk him away. Trump is "fine," a spokesperson said.
The alleged shooter was killed by snipers. Corey Comperatore, a firefighter and a father of two daughters, died in the shooting Pennsylvania Gov. Josh Shapiro said. Two other people who attended the rally were also injured.
A local sheriff has confirmed to ABC News that an officer tried to stop the suspect moments before shots were fired.
The roof where the suspected gunman fired shots at former President Donald Trump had been surveyed during security preparations for the event, a law enforcement source told ABC News.
The roof was empty during those security preparations, the source said.
As reports of suspicious activity came in, a search was initiated, the source said. It was unclear how the suspect climbed onto the roof to quickly get off shots before a Secret Service counter-sniper located and killed him, the source said.
Officials continue on Sunday to investigate whether the dead suspect was connected to domestic extremists, the source said. The early investigation turned up no ties to international terrorism, the source said.
The Bethel Park School District confirmed on Sunday that the suspected gunman was a graduate of Bethel Park High School and graduated with the Class of 2022.
"The school district wishes to express its sincere wishes for a speedy and full recovery for Mr. Trump and for those in attendance at the Saturday event who may have been physically harmed or emotionally impacted by these tragic events. We offer special condolences to the family of at least one attendee who was killed. Our thoughts and prayers are with you at this difficult time," the district said in a statement.
-ABC News' Sasha Pezenik
In an internal Trump campaign memo sent to staff, and obtained by ABC News, Susie Wiles and Chris LaCivita ask staff to avoid the campaign offices in D.C. and West Palm Beach and say they're enhancing the armed security presence with 24/7 officers on site.
Wiles and LaCivita said the Republican convention will continue as planned and asked staff not to comment publicly on what occurred.
"We condemn all forms of violence, and will not tolerate dangerous rhetoric on social media," they said in the memo.
-ABC News' Katherine Faulders