() The Secret Service has suspended six agents following last year’s assassination attempt on Donald Trump in Butler, Penn., a source confirms.

They were suspended following an investigation into the attempted assassination, and specifically their actions at that time, the source within the Secret Service told .

The jobs of the six agents, according to the source, range from supervisory to line level.

The news comes just days shy of the one-year anniversary of July 13, 202, shooting, which occurred at a campaign rally held by then-candidate Trump during the presidential race.

Thomas Matthew Crooks, 20, was able to climb onto a roof at the property where the campaign rally was being held and fired off several shots before counter-snipers killed him. Trump and two others were injured, and rally attendee Corey Comperatore, 50, was fatally wounded as he tried to shield his family.

will air a special, “The Plot to Kill Trump,” at 8 p.m. Central on Sunday.