FBI agents involved in the traffic stop that led to the killing of one of the armed occupiers of an Oregon wildlife refuge are under investigation for not disclosing they fired shots that missed Robert "LaVoy" Finicum, authorities said Tuesday, reports the Associated Press.

Oregon State Police troopers fired the three rounds that killed the Arizona rancher during a confrontation on a remote road, law enforcement officials said at a news conference in Bend.

An independent investigation by Oregon authorities found the troopers were justified in shooting Finicum because he failed to heed their commands and repeatedly reached for his weapon, Malheur County District Attorney Dan Norris said.

The investigators discovered members of an FBI hostage rescue team who were at the scene failed to disclose they fired two rounds.

The U.S. Justice Department's Office of Inspector General said it is investigating the FBI team's actions, working with Oregon officials.