This blurry image shows a Yellowstone law-enforcement ranger encountering an armed suspect, circled in yellow, this past July 4 at Canyon Lodge/NPS

Video footage from a July 4 gun battle between Yellowstone National Park law-enforcement rangers and a gun-wielding man who was killed in the incident was released Thursday.

Accompanied by schematic diagrams to depict the various positions of rangers and the suspect, Samson Lucas Bariah Fussner, 28, of Milton, Florida, at Canyon Lodge in the center of the park, the nearly 21-minute video captured key moments when gunfire was exchanged.

While the law-enforcement rangers all wore body cameras, not all of the cameras were activated prior to the shooting. National Park Service policy allows for exceptions to that requirement "when faced with an emergency situation requiring immediate action to preserve life or safety."

Much of the video that was released shows closeup shots of the rangers' hands and weapons, though one did show a ranger encountering Fussner and firing shots at him. The video released doesn't depict the moment when Fussner was shot and fell to the ground, but video of a law-enforcement ranger taking a semi-automatic rifle off the suspect is shown, as is that of rangers providing first aid to a colleague who was shot in a lower extremity. A still photo contained in the video showed numerous gunshot holes in doors at the lodge.

"The video is intended to help community members gain a better understanding of what occurred," a park release accompanying the video said. "This incident is still under investigation. The investigation, which includes the actions taken by NPS law enforcement officers, is being led by the Federal Bureau of Investigation. All information in the community briefing video is based on the details currently available. Some images and audio in this video have been altered or concealed to protect the privacy of the individuals involved." 

These still photos depict "multiple entry and exit holes" at the loading dock at Canyon Lodge from the gun battle/NPS

Information the park released in the days following the shooting described Fussner firing a semi-automatic rifle while walking toward Canyon Lodge, reportedly determined to conduct a mass shooting.

According to that park release, an unidentified woman contacted Yellowstone’s 911 dispatch center shortly after midnight on July 4 and said she had been held against her will by a man with a gun in a residence at Canyon Village. Both the woman and Fussner worked for Xanterra Parks and Resorts, Yellowstone's dining and lodging concessionaire.

“She also reported to law enforcement rangers that Fussner threatened to kill her and others, including plans to allegedly carry out a mass shooting(s) at July 4th events outside the park,” the July news release added.

Law enforcement rangers who initially responded to Canyon Village found the suspect's unoccupied vehicle in the Canyon area and began to deploy around the area to both look for Fussner and protect park visitors.

Before long more than 20 law enforcement rangers were on the scene, including the park’s special response team, in the search for Fussner.

“At approximately 8 a.m., law enforcement rangers posted near Canyon Lodge, which houses employee and public dining rooms, encountered Fussner,” the park release said. “Fussner reportedly walked toward the service entrance of the facility while firing a semi-automatic rifle. The building was occupied by approximately 200 people at the time. Several law enforcement rangers engaged Fussner. During an exchange of gunfire, Fussner was shot by law enforcement rangers.”

The incident prompted the temporarily closure of the Canyon Lodge and Canyon Campground.