The attacker was identified as 45-year-old Michael Brown of Anaconda.

The Montana Division of Criminal Investigation confirmed to CBS News that the shooting happened at The Owl Bar in Anaconda at around 10:30 a.m. local time.

The agency did not share details about the shooting.

According to reports, the attacker lived close to the bar.

Authorities were searching for the suspect west of Anaconda near Stumptown Road and Anderson Ranch Loop Road, the state Division of Criminal Investigation  was quoted as saying by CBS News.

Anaconda-Deer Lodge County Law Enforcement Center wrote on Facebook: "Be advised suspect in shooting is believed to be armed and dangerous. Suspect is Michael Paul Brown and was last seen in the stumptown area. Public is advised to stay out of the stumptown area and surrounding areas. If seen do not approach. Contact 911 for any way to contact Michael Paul Brown."

Montana Highway Patrol alerted that authorities are searching for a suspect believed to be armed.

Montana Governor Greg Gianforte said he is currently monitoring the situation.

He wrote on X: " 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."

Anaconda is a former copper smelting job.