Bodycam footage released by Sen. Chuck Grassley, R-Iowa., on Thursday shows the law enforcement response to the rooftop where Thomas Crooks took a sniper's position in the attempted assassination of former President Trump. The video shows Beaver County Emergency Service Unit officers and U.S. Secret Service personnel accessing the rooftop from where Crooks fired an AR-15-style rifle at Trump as he addressed a crowd of supporters in Butler, Pennsylvania. One spectator was killed, and Trump and two other supporters were injured at the Republican presidential candidate's rally in Butler. "July 13 Bodycam footage provides more info than Secret Service will share [with] America," Grassley wrote in a post on X. "We NEED detailed answers ASAP on security failures TRANSPARENCY BRINGS ACCOUNTABILITY." The senator said his office obtained the video from the Beaver County ESU in compliance with congressional requests. FBI REVEALS HOW THOMAS CROOKS OBTAINED GUN USED IN ATTEMPTED TRUMP ASSASSINATION A split image of Beaver County Emergency Services Unit responders investigating the roof of the building where Thomas Crooks shot at former President Trump (left) and a spotlight on the rifle he used (right). A Beaver County Emergency Services officer investigates the roof of the building where Thomas Crooks shot at former President Trump (left) and finds the rifle he used (right). (Beaver County ESU obtained by Sen. Grassley) In the moments after the assassination attempt, the video shows ESU officers and Secret Service agents running towards the shooter and quickly accessing the AGR building rooftop where shots had been fired. On the rooftop, a trail of blood can be seen leading to the body of 20-year-old Thomas Crooks. An AR-15-style rifle is also seen lying next to him, as well as shell casings. One of the law enforcement personnel on the rooftop counted at least eight casings. An officer seen searching Crooks' body finds a cell phone and a transmitter. "It is a remote control device. It is gray in color, about five, six inches tall," the officer reports. TRUMP SHOOTER WAS NOT ONLY SUSPICIOUS PERSON AT BUTLER RALLY: PENNSYLVNAIA STATE POLICE COMMISSIONER Beaver County Emergency Services officers and a Secret Service agent exchange information on the roof of the building where Thomas Crooks took shots at former President Trump. Personnel responding to the attempted assassination of former President Trump exchange information. (Beaver County ESU obtained by Sen. Grassley) The responding officers were worried about a potential explosive device near the area. "Tell the FBI to hurry the f--- up," one officer says. FBI Director Christopher Wray testified to the House Judiciary Committee on Wednesday, sharing new details about explosive devices found in Crooks' car and home. Wray said investigators found three explosive devices they believe belonged to Crooks. Two were found inside Crooks' vehicle near the Butler rally, and one more was found inside his home. He described the devices as "relatively crude," but shared they were rigged for remote detonation and still posed a major threat. TRUMP RALLY LAW ENFORCEMENT ‘LOST SIGHT’ OF GUNMAN CROOKS BEFORE SHOOTING: BODYCAM Two Beaver County Emergency Services officers stand on a roof. One shows a member of the U.S. Secret Service information on his cell phone after finding the body of Thomas Crooks. A Beaver County Emergency Services officer shows a member of the U.S. Secret Service information on his cell phone after finding the body of Thomas Crooks. The FBI director also confirmed his agency has gained access to Crooks' phone, but he said their efforts have been hampered by Crooks' routine use of encrypted messaging apps. Wray said the investigation has not ruled out the possibility that Crooks was working with one or more accomplices. According to Wray's testimony, no one saw Crooks with the rifle before he got onto the AGR rooftop. The shooter used a collapsible stock, which made the gun easier to hide, the director said. FBI investigators found and recovered a drone Crooks used to scout the area where Trump's rally took place. Wray said both the drone and controller were in Crooks' vehicle at the time of the shooting. Investigators believe Crooks flew the drone around near the venue between 3:50 p.m. and 4:00 p.m. on the day of the rally. The drone was roughly 200 yards away from the stage during the flight. Subscribe to LiveNOW from FOX! https://www.youtube.com/livenowfox?sub_confirmation=1 Where to watch LiveNOW from FOX: https://www.livenowfox.com/ Follow us @LiveNOWFOX on Twitter: https://twitter.com/livenowfox Raw and unfiltered. Watch a non-stop stream of breaking news, live events and stories across the nation. Limited commentary. No opinion. Experience LiveNOW from FOX.