The gunman in the attempted assassination of former President Donald Trump is believed to have flown a drone around the Pennsylvania rally site ahead of time in an apparent attempt to scope out the site before the event, a law enforcement official said Saturday.

The drone has been recovered by the FBI, which is leading the investigation into last Saturday's shooting at the rally by 20-year-old Thomas Matthew Crooks.

Crooks fired multiple rounds from the roof of a building adjacent to the Butler Farm Show grounds, where Trump was speaking, before being fatally shot by a Secret Service counter sniper. The existence of the device and its use at some point before the shooting could help explain why Crooks knew to fire from the point.

This aerial photo of the Butler Farm Show, site of the Saturday, July 13, 2024 Trump campaign rally, shown Monday, July 15, 2024 in Butler, Pa. On Saturday, Republican presidential candidate former President Donald Trump was wounded during an assassination attempt while speaking at the rally. (AP Photo/Gene J. Puskar)... Read More: FOX45