Trump shooting updates: Shooter flew drone 200 yards from site hours before shooting
One spectator was killed and two were hurt in the shooting on July 13.
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 July 13.
The alleged shooter was killed by snipers. One spectator was killed and two were hurt, officials said.
Latest headlines:
Thomas Matthew Crooks visited Pennsylvania rally site morning of shooting
The suspected gunman who attempted to assassinate former President Donald Trump at his campaign rally over the weekend had visited and left the event site in Butler, Pennsylvania, before returning that evening, sources told ABC News.
Crooks came to the rally site on the morning of the shooting, stayed there for an hour, left and then came back sometime in the early 5 p.m. ET hour, sources said.
Suspected gunman seen with range finder and duffel bag before shooting, sources say
The suspected gunman at former President Donald Trump's rally Saturday was seen with a range finder and a duffel bag ahead of the deadly shooting, multiple law enforcement sources confirm to ABC News.
Attendees who spotted the suspected shooter, 20-year-old Thomas Matthew Crooks, with the items notified law enforcement, sources said.
Additionally, Crooks had two cell phones, one on him and a second one found at his home, sources said.
DHS Inspector General opens 3rd probe into US Secret Service
The Department of Homeland Security Office of Inspector General is opening its third probe into the security that led to the assassination attempt of former President Trump.
In a statement Thursday, the agency said the third probe will investigate the U.S. Secret Service's planning and implementation activities for protective operations.
"Our objective is to determine the extent to which the Secret Service plans and implements protective activities to ensure the safety and security of designated protectees," the Department of Homeland Security Office of Inspector General said.
The announcement follows two prior probes into the deadly shooting at Trump's rally in Pennsylvania over the weekend.
The first, announced on Tuesday, initiated a review to examine the Secret Service's process to secure the campaign event.
The second, opened Wednesday, initiated a review of the Secret Service Counter Sniper Team's preparedness and operations.
Trump met with Secret Service Director Kimberly Cheatle in Milwaukee
Former President Donald Trump met with Secret Service Director Kim Cheatle to discuss the assassination attempt made against him at his Pennsylvania rally Saturday, a source told ABC News.
The meeting took place on Tuesday at the former president's hotel in Milwaukee, the source said.
This comes as Republicans are calling for Cheatle's resignation in the wake of the deadly shooting.
-ABC News' Luke Barr