BILLINGS, Montana — Two Montana inmates were charged with attempted murder Tuesday after they allegedly used improvised weapons to attack correctional officers at a county jail, leaving one of the officers hospitalized with stab wounds to the head.

The two inmates pleaded not guilty during their court hearings via video from the Yellowstone County Jail.

The two officers were victims of an unprovoked attack on Saturday night, Sheriff Mike Linder said. The attack was captured on surveillance cameras, but Linder refused to release the footage.

At Tuesday's hearing, prosecutor Hojae Chung of the Yellowstone County District Attorney's Office said one of the inmates repeatedly stabbed one of the officers in the back of the head with an improvised knife, causing severe bleeding. The officer was treated at a hospital and released later that night. He is expected to make a full recovery, the sheriff said.

Judge Bradley Kneeland set bail for 20-year-old Myron Scott Goes Ahead at $1 million and for 18-year-old Ashtin Zant Glen at $500,000 on Tuesday. The two inmates also face weapons charges and could be sentenced to life in prison if convicted of attempted murder.

Goes Ahead was being held in jail while awaiting trial on two counts of murder stemming from a shooting last year in Billings that killed a man who then fell on top of a boy who also died. Goes Ahead and another person were accused of stealing ammunition from a sporting goods store and then firing a volley of bullets into the home containing the victims. The boy, who was nearly a year old, suffocated when the man who had been carrying him was shot and fell on top of him, authorities said.

Glen was being held on charges including attempted murder. Authorities said he was accused of shooting and wounding a man during a shootout last year and later firing at police officers as he fled the scene.