A “fundamental security failure” allowed a gunman to get close enough to Donald Trump to shoot him, according to an analysis of the scene of the assassination attempt.
Sky News analysis of the area where the former president was shot from as he gave a speech to supporters in Butler, Pennsylvania, on Saturday, suggests a large tree blocked the view between the gunman and the closest armed protection unit.
Two armed units could be seen on the two warehouses behind Mr Trump, but because of the tree only the unit that was further away from the shooter had a clear view of him.
Thomas Matthew Crooks, 20, was on top of a warehouse between 130-140m from Mr Trump when he fired several rounds at the former president before being shot and killed by Secret Service agents.
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Mr Trump was hit in the ear in the assassination attempt but has said “God alone who prevented the unthinkable from happening”, while one spectator – named as 50-year-old Corey Comperatore – was killed and two others seriously injured.
Security experts familiar with the demands of keeping politicians safe said “a fundamental security failure” occurred to allow the gunman to get close enough to carry out his attack.
Among those to comment was Steve Nottingham, who has helped provide security for visiting world leaders, including presidents.
The former Special Weapons and Tactics (SWAT) team commander, suggested pre-event research and real-time monitoring of places a gunman could shoot from had broken down.
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He told NBC, Sky’s US partner: “They were behind the curve, because they should have had those places covered ahead of time.”
His comments come after the BBC interviewed a man who described himself as an eyewitness, who said he saw a man armed with a rifle crawling up a roof near the event.
The person, who the BBC did not name, said he and other people he was with started trying to alert security, pointing at the man.
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Retired Bureau of Alcohol, Tobacco, Firearms and Explosives (ATF) agent Jim Cavanaugh said he was surprised the gunman was able to occupy a raised position within rifle range of the rally site.
Mr Cavanaugh said: “Whenever I’ve been with them, every single high ground is taken by them or the local SWAT police. There’s nobody allowed walking on rooftops. They command the high ground.”
He said a high-powered rifle like an AR-15 can hit targets 600ft (182m) away and Mr Trump was about 444ft (135m) from the rooftop where the shooter was found dead, NBC News said, based on an analysis of Google Earth images.
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Mr Cavanaugh said: “Having been on Secret Service details, it’s amazing to me that somebody was on an elevated position that they didn’t know about.”
But Pennsylvania State Police Lieutenant Colonel George Bivens defended those in charge of security, calling it “incredibly difficult to have a venue open to the public and to secure that against any possible threat against a very determined attacker. That’s a huge lift”.
The Secret Service did not immediately respond to a request for comment on its role, NBC said.
But a spokesman for the service has denied online reports that it refused requests from the Trump campaign for greater security.
Spokesperson Anthony Guglielmi said in a statement on the X social media platform on Sunday: “There’s an untrue assertion that a member of the former president’s team requested additional security resources and that those were rebuffed.
“This is absolutely false. In fact, we added protective resources & technology & capabilities as part of the increased campaign travel tempo”.
FBI special agent Kevin Rojek told reporters law enforcement was not aware there was a man on the rooftop until he started firing, and said it was “surprising” how many shots the gunman managed to fire.
Trump supporters in the front row of the rally heard a series of pops and saw Secret Service agents jump on the stage as Mr Trump, the presumptive Republican candidate in November’s presidential election, ducked.
Mr Trump said in a post on his Truth Social site a couple of hours later that a bullet “pierced the upper part of my right ear.
“I knew immediately that something was wrong in that I heard a whizzing sound, shots, and immediately felt the bullet ripping through the skin. Much bleeding took place, so I realised then what was happening.”
Former Secret Service agent Evy Poumpouras, who has protected multiple presidents, including Barack Obama and George W Bush, said it is impossible to eliminate every potential threat at a rally.
She said: “Somebody can be out in the distance and really engage your target from a long range, and there are weapons out there that allow you to do this.
“Let’s say you hunkered [locked] this whole area down. You’ve got the magnetometers (instrument used for measuring magnetic forces); you’ve got the tactical element. Everything is locked and tight. How do you secure that outer perimeter? How far do you go? And can you cover everything? That’s a problem.
“Even if somebody is in an elevated position or not, how do you secure all of those elevated positions when you have weapons with the capabilities that are able to shoot long distances? This is what you are up against.”
Former New York City police officer Jillian Snider said it is routine for law enforcement to do a perimeter check extending a few hundred yards ahead of such an event.
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“That doesn’t mean that someone can’t sneakily make their way to one of those positions afterward, especially if it was someone who had done some preplanning. There are a lot of places in that area to hide, and you can’t monitor every possible position.
“Someone who is that driven to do something like this will find a way to try and get the job done.”