Authorities in Montana are still searching for a 45-year-old U.S. Army veteran who allegedly entered a bar and cold-bloodedly gunned down four people last week. The suspected shooter, Michael Paul Brown, was still on the lam as of Monday as law enforcement continued the pursuit.

According to a news release from the Montana Attorney General”s Office, Brown at about 10:30 a.m. on Friday entered The Owl Bar in Anaconda where he opened fire, killing the bartender, 64-year-old Nancy Lauretta Kelley, as well as three patrons: 59-year-old Daniel Edwin Baillie, 70-year-old David Allen Leach, and 74-year-old Tony Wayne Palm.

The bar is about 250 miles west of Billings.

Attorney General Austin Knudsen on Sunday held a news conference where he provided an update on the search and some additional details about the suspect.

According to Knudsen, the photograph of Brown released by the state’s Department of Justice, which showed him “largely naked” in just his underwear, was captured “relatively soon after the crime was committed,” when he went to a second location that was not far away and “got rid of his clothes” and some personal belongings.

Shortly thereafter, Brown allegedly stole a vehicle that was “loaded with” camping equipment, meaning that the suspect was likely able to get himself clothed and out of the area.

“At this point, we have every reason to believe the suspect is fully clothed, shoes on his feet, able to get around,” Knudsen said.

Brown was last seen at around noon on Friday when he was spotted by law enforcement and a brief chase ensued. However, Knudsen said there was “some confusion” due to two different while vehicles being involved in the pursuit and authorities could not detain Brown.

The AG said he was not sure if Brown knew the victims, but said that from what he had gathered, it seemed like Brown was “a regular” at The Owl Bar and “he literally lived next door” to the establishment.

“I think it’s likely that he knew the bartender and these patrons, which makes this even more heinous,” Knudsen said.

While Knudsen said it was possible that Brown, whom he described as being “unstable,” had already taken his own life, he said that authorities were operating under the assumption that Brown is “alive, well, armed, and extremely dangerous.”

The AG reportedly told NBC News that investigators had recovered the car Brown allegedly stole, which led them to believe that the suspect was “very likely up in the mountains, hiding in the timber, in the cover somewhere.”

According to a report from The Associated Press, Brown was an armor crewman who served in Iraq for about a year before he returned to the U.S. in March 2005. He then served in the Montana National Guard from 2006 until 2009.

Brown’s niece told the wire service that since his return from Iraq, her uncle had struggled with mental health issues and often does not know who, where, or even when he is.

Officials are offering a reward of $7,500 for information leading to Brown’s arrest.