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An analysis of bird's-eye footage of the Butler Farm Show, the venue where Thomas Matthew Crooks shot at former President Trump and killed a bystander, lays bare the apparent tactical shortcomings of the U.S. Secret Service's counter sniper strategy on July 13, according to an expert.

Crooks, 20, killed local firefighter Corey Comperatore and injured 74-year-old James Copenhaver and 57-year-old David Dutch when he fired a volley of rounds toward Trump from a rooftop about 150 yards away at the agricultural fairground in Pennsylvania

Former NYPD inspector and Fox News contributor Paul Mauro told "America’s Newsroom" that he spoke with attendees who said the whole event felt "unsecured" in comparison to other rallies. They told him they were not checked with wands or scanned using a metal detector as they entered the venue. 

TRUMP SHOOTING: TIMELINE OF ASSASSINATION ATTEMPT RAISES QUESTIONS ABOUT HOW GUNMAN EVADED SECURITY

The Butler Farm Show, site of a campaign rally for Republican presidential candidate former President Donald Trump

The Butler Farm Show, site of a campaign rally for Republican presidential candidate former President Trump, is seen Monday, July 15, 2024 in Butler, Pennsylvania. Trump was wounded on July 13 during an assassination attempt while speaking at the rally. (AP Photo/Gene J. Puskar)

The drone footage of the 100-acre site shows the spot where the stage was situated and two red buildings, upon which counter snipers were stationed. 

While Crooks had a full view of them on top of the lower-set gray building across from the stage, Mauro said tree growth and snipers' angle made only part of that roof visible to them.

Mauro spoke with Butler residents who attended past Trump rallies and who said the rally on July 13 felt "very disorganized."

A source familiar with the investigation told Fox News that the sniper who killed Crooks with one bullet had a "one-in-a-million" shot, and was only able to see the top of his head and his gun scope because of the roof's lip. 

TRUMP ASSASSINATION ATTEMPT: BUTLER, PENNSYLVANIA TOWN MANAGER DEFENDS POLICE AMID RESPONSE 'MISCONCEPTION'

Butler Farms Crooks building

Pictured is the building that Thomas Crooks clambered up to shoot at former President Trump. Former NYPD Inspector Paul Mauro suspects that Crooks used the hallway adjoining the two buildings to get onto the roof and stashed his AR-15 in the air conditioning unit pictured. (Fox News)

U.S. Secret Service Director Kimberly Cheatle has previously stated that the sloped roof of the building where Crooks perched was a "safety hazard," and that agents were stationed inside the building instead. 

"If you look at the windows that face the stage, they look very narrow and its not entirely clear whether they can even open," Mauro said. "Those windows have been described by federal officials as an observation post. It's hard to see how those low windows, which don't even look like they open and are positioned to ground level would afford a very good observation post for officers inside to look out of."

SECRET SERVICE DIRECTOR TESTIFIES ABOUT TRUMP ASSASSINATION ATTEMPT

Butler Farms Show

Secret Service agents were positioned on the right and left red buildings. (Fox News)

Hallways adjoining the building to another beside it provided an access point where Crooks could have clambered onto the roof, Mauro said. An air conditioning unit seen from above may be where he stashed his AR-15 ahead of the rally, sources told Mauro. 

Meanwhile, windows that gave agents a direct vantage point of the roof from a building next door are also visible in the footage.

PENNSYLVANIA GOP ACTIVIST WHO'S BEEN TO 20 TRUMP RALLIES SAYS BUTLER EVENT WAS LEAST SECURE VENUE HE'S BEEN TO

Butler Farm Show

Former NYPD Inspector Paul Mauro questioned how U.S. Secret Service agents stationed inside the building were able to adequately oversee the rally through these small, low-set windows that may not have opened. (Fox News)

"It's almost impossible for them to have missed Tom Crooks clambering onto that roof holding an AR-15," Mauro said. 

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Cheatle is appearing before lawmakers on Monday about the assassination attempt. An independent committee has been assigned to review the agency's actions before and during the attack.