The problem is that FBI agents did not tell investigators they had fired the shots. Reportedly no one inventoried the FBI agents’ guns because none of the other people present had seen them shoot, and they didn’t say they had. Worse, there's some reason to believe the shots were intentionally concealed, The Oregonian reports. A state trooper reported seeing two bullet casings on the ground after the shooting. Those casings were copper-colored, while OSP uses only silver-colored casings. But those copper-colored casings were not found later in a sweep of the site.

Greg Bretzing, the FBI agent in charge of Oregon, issued a statement acknowledging the discrepancy:

The county’s investigation also indicated that, in between the two series of shots fired by OSP troopers, one, and possibly two, additional shots were fired by law enforcement as Mr. Finicum was exiting the vehicle after hitting the snow bank. As autopsy results confirm, neither of these shots struck Mr. Finicum. The question of who fired these shots has not been resolved. Upon learning this, and given the FBI presence on scene, I immediately contacted our Inspection Division which notified the United States Department of Justice’s Office of Inspector General which is currently investigating this matter.

Officials also released the video Cox shot. It’s a counterpart of the FBI’s video, which was filmed from a surveillance plane, and does a good job of capturing the broad outlines of the incident but little to illuminate the details. Cox’s video is also limited—it reveals some details about Finicum and the crash before he was shot, but it’s tough to tell what’s going on outside the truck.

The footage shows Finicum taunting officers during the first stop, when both vehicles were intercepted, holding his arms outside the window and telling them to go ahead and shoot him if they pleased but that he intended to go meet the Grant County sheriff in John Day. The passengers are heard complaining they don’t have cell service to get in touch with other people on the remote road. Then Finicum tells everyone to get down and guns the engine—unbeknownst to him, directly toward the roadblock.

“Hang on! Hang on!” Finicum says. Then comes the impact—and the second stop. He jumps out of the car and shouts, “Go ahead and shoot me!”

The people in the car scream as gunshots ring out and try to figure out what’s happening outside the car. There are sounds of explosions—possibly flash-bang grenades—and smoke starts to fill the car. The passengers still in the car can see the laser sights on guns dancing around the car. “I don’t dare get out, ’cause they’ll shoot me,” one woman says. The video then ends.

The four FBI agents were part of the bureau’s elite Hostage Rescue Team. As The Washington Post reports, the operators were shadowy and mysterious even to the state police working alongside them.