(NewsNation) — A manhunt is still underway for a gunman days after allegedly killing four people at a bar in Anaconda, Montana.
Deputies spent Saturday traversing a rugged mountainous area of Montana with helicopters overhead.
The FBI is helping in the search for Michael Paul Brown, 45, after the shooting at The Owl Bar, according to the Anaconda Deer-Lodge County Law Enforcement Center.
Brown, a former military veteran, lives next door to the bar but has yet to be caught after a SWAT team searched his home.
The search was still focused on an area off Stumptown Road west of Anaconda, both on the ground and by air, and included multiple local, state, and federal agencies.
Anaconda-Deer Lodge Police Chief Bill Sather said Saturday that businesses in the area could open, but he urged caution as Brown is considered armed and dangerous.
Anyone who sees him is asked to contact 911. More than a dozen officers have flooded Anaconda, a town with a population under 10,000 in southwestern Montana, after shots were fired at around 10:30 a.m. Friday.
The Montana Division of Criminal Investigation is leading the investigation and confirmed four people died at the scene. Three patrons and the bartender at The Owl Bar were killed, according to owner David Gwerder.
The FBI sent agents to the scene to help with the investigation, FBI Deputy Director Dan Bongino said.
“I’m closely monitoring the situation involving an active shooter in Anaconda. Please join Susan and me in praying for the victims, their loved ones, and the brave law enforcement officers responding to this tragedy,” Montana Gov. Greg Gianforte said in a statement.
The ATF Denver Rocky Mountain Region said it is working alongside local law enforcement.
“ATF continues to work alongside our local law enforcement partners on this investigation, where multiple casualties have been confirmed at The Owl Bar. Please send all media inquiries to local law enforcement as they are the lead investigating agency,” ATF wrote in an update.
Brown served in the U.S. Army as an armor crewman from 2001 to 2005 and deployed to Iraq from early 2004 until March 2005, according to Lt. Col. Ruth Castro, an Army spokesperson. He was in the Montana National Guard from 2006 to March 2009, Castro said. Brown left military service in the rank of sergeant.
The Associated Press contributed to this report.
The Associated Press contributed to this report.
Four people are dead after a shooting at a bar in Anaconda, Montana (Source: NBC Montana) 
Michael Paul Brown is the suspect, accused of shooting four dead in Montana 
Police have warned the public to stay indoors and avoid the area until the suspect is caught (Source: NBC Montana) 
SWAT vehicles and armed police have descended upon the town in search of the shooter (Source: NBC Montana) 
Police are searching for the gunman after the killings at Owl Bar in Deer Lodge County (Source: NBC Montana)