Chilling video made by one of the victims of the attack donald trump shows a shadowy figure running across a rooftop moments before the former president was shot.

The disturbing clip was made by James Copenhaver who, moments later, was seriously injured in the shooting in Butler, Pennsylvania, on July 13.

In footage, obtained by Fox Digital, the figure appears briefly on a rooftop overlooking where Trump was being cheered by his rally crowd.

He appears to look toward Trump before running further along the roof. At the same time, Trump turns and almost looks directly at his would-be assassin before running away.

Three minutes after the video of the bomb was recorded, 20-year-old Thomas Crooks fired a hail of eight bullets, hitting both Trump and Copenhaver.

Heroic firefighter Corey Comperatore, 50, died while trying to protect his family during the attack.

Copenhaver, 74, suffered “life-altering injuries” but has recently been released from hospital.

He is still recovering at a rehabilitation center, according to his lawyer, who said he was hit in the arm and abdomen.

“He almost saw or heard something go past him, which we assume was a bullet,” said attorney Joseph Feldman.

“He felt it in his arm, and he looked at his arm … and he felt pain initially, but he didn't even realize he'd been shot a second time at the time. It could have been a shock.

David Dutch, 57, was the fourth person injured and was reportedly shot twice and has undergone two surgeries.

Crooks was killed by a Secret Service sniper, but significant questions remain about the security breaches that allowed him to carry out the attack.

The video was recorded by James Copenhaver, a rally attendee in Butler, Pennsylvania, who was seriously injured in the assassination attempt.

The lone gunman was identified as a suspicious person before the shooting and was seen walking around the scene in the hours before.

A disturbing video taken by someone in the crowd appears to be shown Scammers following a building would go up 60 minutes later in order to get the perfect vantage point from which to target Trump.

According to the FBI, he managed to climb onto the roof of the AGR building by scaling HVAC equipment and pipes and jumping across several roofs.

Police met a suspicious person near the rally site about 90 minutes before the shooting began and took pictures of Crooks at the scene.

Secret Service Director Kimberly Cheatle was forced to resign amid backlash over the blunders.

The FBI is still trying to investigate Crooks' motive. A classmate told DailyMail.com he had he had previously been investigated for threats to “shoot up” his school when he was only 15 years old.

Firefighter Corey Comperatore, 50, died while protecting his family during the shooting

The director of the FBI, Christopher Wray, has cast doubt on whether Donald Trump was shot during the attempt on his life at a political rally in Pennsylvania.

The incident was not taken seriously at the time, but is now being investigated by the agency.

In his first interview after the assassination attemptTrump said he survived “by luck or by God.”