The would-be assassin who injured former president Donald Trump at a Pennsylvania rally was only on a nearby rooftop for six minutes before opening fire.
The bipartisan House of Representatives committee tasked with investigating the July shooting has released a report, describing in detail the minutes leading up to shots being fired.
One man was killed in the attack, and two others were critically injured. All three were civilians attending the rally.
Thomas Matthew Crooks, a 20-year-old nursing aide, was shot dead by a Secret Service sniper at the scene.
"Crooks was in the United States Secret Service (USSS) counter sniper's sights for 'mere seconds' before [the sniper] fired," the report said.
The report found the Secret Service had failed to "clearly define responsibilities for planning and security".
It also found the Secret Service had failed to ensure the building used by Crooks was properly secured, did not "effectively coordinate" with state and local law enforcement, denied requests for resources and failed to communicate with key personnel.
Technical problems also plagued officers, at some points leaving systems inoperable for hours at a time.
The detail in the report offers the most precise timeline to date of the assassination attempt as it unfolded.
3.51pm EDT, July 13
At 3.51pm on the day of the shooting, Crooks flew a drone "approximately 200 yards from the Farm Show grounds".
He had arrived at the venue early that day, before leaving and returning to stream video from the drone for about 11 minutes.
A counter unmanned aircraft system (C-UAS) set up at the scene was inoperable until 4.33pm, meaning the drone went undetected.
"[Had] the C-UAS system been active and detected Mr Crooks' drone, the CUAS Advance Agent stated he would have sent USSS personnel to conduct a voluntary interview with Mr Cooks to determine the purpose of his flight," the report said.
"[Acting Secret Service Director Ronald Rowe] testified … that the outage of the C-UAS system had cost him 'a lot of sleep because of the eventual outcome of the assailant'.
"[He] testified that perhaps had the C-UAS system been operational at 3.51pm, USSS agents would have spoken with Crooks and he could have decided not to go through with [the attempt]."
4.26pm EDT
The FBI said digital evidence showed Crooks walking "past a row of vendors outside the secure perimeter" about 800 metres away from the American Glass Research (AGR) building at 4.26pm.
Snipers were positioned inside the building, the rooftop of which Crooks would later use as his vantage point.
As one exited the building at the end of his shift, he noticed a "suspicious person" and texted the two snipers still inside.
"Someone followed our lead and snuck in and parked by our cars just so you know," he wrote, according to the report.
"I'm just letting you know because you see me go out with my rifle and put it in my car so he knows you guys are up there.
"He's sitting to the direct right on a picnic table about 50 yards from the exit."
5.10pm EDT
At 5.10pm, law enforcement had their first confirmed sighting of Crooks, "one hour and one minute before the shooting".
A local sniper set up in a window inside the AGR building watched him walk past.
Four minutes later at 5.14pm, that sniper took a photo of Crooks with his phone.
"That sniper later told the committee that he was not sure at the time why he took the photograph, but that something seemed off about the individual," the report said.
5.32pm EDT
The sniper continued to watch Crooks "looking at [his] phone, news feeds" and a rangefinder, a small device used by hunters to measure distance.
At 5.38pm, he texted two photographs of Crooks to other local snipers posted around the building and the rally grandstands.
"Kid learning [sic] around building we are in," he wrote.
"I did see him with a rangefinder looking toward stage. FYI. If you wanna notify SS snipers to look out. I lost sight of him."
The message added a backpack and a bike that had not been seen earlier was left by the rear of the building.
After sending the message, a sniper went to the AGR building's exit in an attempt to keep track of Crooks.
5.42pm EDT
At 5.42pm, the sniper who had first seen Crooks repeated his warning, telling other local law enforcement on their radio channel of a "younger white male long hair [sic] lurking around".
An emergency services unit (ESU) commander responded at 5.43pm: "Copy. We will send somebody to check it."
At 5.44pm, Secret Service officials got their first confirmed communication about Crooks, "approximately 27 minutes before the shooting".
About the same time, Pennsylvania State Police (PSP) officers and a Butler County sheriff's deputy were told about the suspicious person.
A minute later at 5.45pm, the Butler ESU commander said via radio that Pennsylvania State Police and the sheriff's department "should be en route".
5.47pm EDT
More officials, including members of the sniper team, were now starting to text back and forth about the search for Crooks, including swapping photos.
At 5.47pm, two undercover state police officers stationed at a nearby petrol station were told to go to the AGR building.
The Butler ESU commander texted the state police sergeant stationed in the Secret Service's security room at 5.48pm, repeating the description and including photos of Crooks.
5.52pm EDT
According to the report, a Secret Service agent then sent the photos to a USSS Counter Sniper Response Team agent at 5.52pm.
"At the same time, the USSS Counter Sniper Team Leader who had received the description of and photographs of Crooks … then sent a 'be on the look out' or 'BOLO' email to all three other USSS counter snipers positioned on the two barn roofs behind the stage," the report said.
5.54pm EDT
At 5.54pm, the Butler ESU commander sent a radio transmission, noting Crooks was "headed towards the stage".
"Our [local sniper] units lost visual of him," he said.
"I believe you guys are outside that fence if you come upon him."
A minute later, a local officer confirmed there was a police unit present, but that an officer sent to look hadn't seen Crooks.
6.00pm EDT
At 6pm, former president Donald Trump took the stage at the rally, an hour after he was scheduled to appear.
At 6.02pm, the sniper who had taken the photo of Crooks got back on the radio: "Alright subject is in between the AGR buildings.
"He's got a backpack now. He just went towards Sheetz [petrol station]."
At 6.03pm, the Butler ESU commander called the state police sergeant to relay the information, who called the police officer nearby.
He told him: "That guy's back. He's walking between buildings. He's headed towards the Sheetz."
The two undercover officers were sent the photograph of Crooks.
6.05pm EDT
The report said that according to the FBI, Crooks "climbed up an air conditioning unit onto a roof on the north end of the AGR complex" at 6.05pm.
"He then moved southward across the connected AGR buildings' roofs with the backpack," the report said.
"FBI later stated that … 'video from local business, police dash cam, and police body cameras confirmed the subject's movement across [the rooftops] between 6.05pm and 6.08pm.
"'Our overall assessment is the subject was only on the roof for approximately six minutes prior to the shooting between 6.05pm and 6.11pm.'"
6.06pm EDT
At 6.06pm, the local sniper met police officers at the AGR exit, to let them know Crooks was "around [the] building on [the] side of [the] fairgrounds".
"Around the same time, a USSS counter sniper … behind the stage 'saw two white vehicles pull into the AGR parking lot' and saw a police officer emerge from one of the two vehicles and begin 'moving urgently'," the report said.
On a Secret Service radio channel, that same sniper said local police were "working something at the three o'clock, approximately 200 yards out".
6.08pm EDT
At 32 seconds after 6.08pm, a local police officer radioed: "Someone's on the roof … I have someone on the roof with white shorts."
A minute later, the same officer radioed again.
"We got him, we don't have him in custody yet, but he's right straight in front of me by the pine tree standing upwards," he said.
Seconds later he said they had "lost sight of him" and were chasing Crooks, "trying to follow him around the building".
6.10pm EDT
According to the report, body camera footage from local police showed Secret Service snipers moving to face the AGR building "between 6.10.08 and 6.10.17".
At 6.11pm, a police officer "was lifted up to the roof by another officer," the report said.
The officer told the committee when he got over the top of the roof, he saw Crooks aiming a gun at him.
"I thought I was f***ed because all he had to do was pull the trigger," the officer said.
"So my hands came off and I went back down onto the concrete."
He then radioed other officers: "He's armed! I saw him, he's laying down! … He's got a long gun!"
At the same time, a member of Mr Trump's Secret Service protective detail contacted their field office counterpart "to inquire about the radio update that there was an issue local law enforcement was looking into".
"Uniformed officers were seen running with their hands on their weapons, and rally attendees were seen running away from the AGR building," the report said.
6.11pm EDT
Crooks fired "an initial volley of three shots" 25 seconds after 6.11pm.
One of these shots struck the former president in the ear.
Crooks fired another five shots as Secret Service officers rushed the stage and covered Mr Trump.
A local police officer told the committee he had seen "Crooks's head and part of his shoulders", watching him fire the eighth round as the officer shouldered his weapon.
"[I] saw the gas come from the muzzle, I heard the snap, and then immediately I returned fire," he testified.
"[Crooks] went down and slowly came back up.
"As he was coming back up, I was ready to press the second one, and that's when [the Secret Service sniper] took him out.
"He went down. He wasn't, like, getting down like a reaction. He slowly slumped over … and then slowly came back up and then got taken out."
According to the report, the sniper "said to his partner, 'I got him,' meaning he had Crooks in his sights".
"At approximately 6.11.40, that USSS counter sniper fired a single shot that killed Crooks," the report said.
Crooks was pronounced dead by a emergency services paramedic at 6.25pm.
