Gunman Thomas Matthew Crooks first came to the attention of local law enforcement as he tried to pass through the metal detectors roughly three hours before firing shots at former President Donald Trump last Saturday. Officials noticed he was carrying a rangefinder and alerted the Secret Service.

Approximately an hour before the assassination attempt, a local sniper team and multiple rally attendees spotted Crooks scoping out the area around the building from where he would soon fire at Trump. According to Fox News, Crooks looked “so suspicious” that the sniper team took a photograph of him.