A gunman opened fire on former President Donald Trump during a campaign rally in Butler, Pennsylvania on July 13, with Trump’s security team and a sniper squad unaware of the threat until the shots were fired.

FBI identified the shooter as Thomas Matthew Crooks, who was known to local police as a 'suspicious person' about 90 minutes before the attack.

Acting Secret Service Director Ronald Rowe acknowledged the security failure, stating that neither the counter-sniper teams nor Trump's security detail were aware of the gunman on the roof.

Crooks fired eight rounds before being neutralized by a Secret Service sniper.

Trump was wounded in the right ear, two rally attendees were injured, and a Pennsylvania firefighter was killed.

Local law enforcement was responsible for securing the rooftop but failed to communicate the threat adequately.

Crooks had flown a drone near the rally site two hours before the attack.

A social media account linked to him showed anti-Semitic and anti-immigration posts, but no definite motive has been established.

The Secret Service admitted to technical difficulties with their counter-drone capabilities on the day of the attack, contributing to the security lapse.

Secret Service Director Kimberly Cheatle resigned following the incident.