The footage is a "portion" of the events that happened at Henry Pratt Co. — one of the largest makers of industrial water valves — when Gary Martin, a 45-year-old disgruntled employee, opened fire.
The clip showed four camera angles that included police pulling up to the warehouse, and Martin after the shooting. After police arrived on scene and ran to the building, he appeared to pace the lobby, often looking through the front doors throughout the nearly 10-minute-long video.
Officers are seen running towards the building as police cars swarm the parking lot and Martin, who is carrying a black ammunition bag and fired 64 rounds during the incident, picks up a bin of cleaning products, throwing them to the ground.
This undated booking photo provided by the Aurora Illinois Police Department shows Gary Martin. (Aurora Illinois Police Department via AP)
Surveillance footage from the February 15 mass shooting released Wednesday shows the moment Gary Martin, 45, prepares to ambush law enforcement officials after being told he was being fired from his job of 15 years.
A few minutes in, Martin could be seen shooting at the police officers through the front door. Soon after, an armored police truck was seen ramming the lobby doors, before seven armed officers slowly entered the building.
Video: Aurora police release surveillance video from Henry Pratt shooting
Police Release Surveillance Video from Henry Pratt Shooting Showing Shooter Firing at Officers, Police Arrival
The footage ended there. Martin, a 15-year-old employee of the company, was killed at the scene. He was shot six times, one of which was likely self-inflicted, the Chicago Tribune reported, citing autopsy results.
Video: Aurora Henry Pratt Workplace Shooting Video Released
The Aurora Police Department wrote on Facebook, alongside the video, that Martin had one pistol and eight pistol magazines on him, and he fired 64 rounds during the incident.
Police said they "were not careless" in releasing the surveillance footage, and chose to do so to be transparent with the community.
Surveillance video of Aurora mass shooting made public
"We agree that you have a right to see for yourself what transpired at the Henry Pratt facility that day where, sadly, five members of our community lost their lives, and five of our police officers were shot while simply doing their jobs," police wrote.
The Aurora Police Department is investigating a shooting at Expo Park, according to a Wednesday morning tweet.
Clayton Parks, 32, Vicente Juarez, 54, Josh Pinkard, 37, and Russell Beyer, 47, were killed in the shooting. Trevor Wehner, a 21-year-old intern at his first day on the job, was also killed.
Police released surveillance video of a shooting that left five people dead and six others wounded in February at an Aurora industrial complex.