Boulder police are investigating an early Saturday stabbing that landed a 20-year-old University of Colorado student in Boulder Community Hospital.

A 19-year-old Illinois man has been arrested on suspicion of assaulting a police officer after he became belligerent with officers who went to the victim's apartment to investigate, police spokeswoman Sarah Huntley said. As of Saturday evening, no one had been arrested for the stabbing.

Emergency room staff called Boulder police around 3 a.m. to tell them they were treating a stabbing victim, Huntley said.

The victim was uncooperative, she said, but police eventually learned he lived in an apartment in the 1100 block of Lincoln Place in Boulder. When officers arrived at the apartment, they found two men inside, along with evidence that the stabbing occurred in the home, Huntley said.

One of the men, Leo Beitz, 19, of Illinois, became belligerent with officers and assaulted one of them, Huntley said. Police used a Taser to control Beitz, and he was taken to Boulder County Jail, where he faces charges of obstruction and third-degree assault on a peace officer.

Huntley said police believe Beitz is a childhood friend of the victim's roommate, who was the second man in the apartment when police arrived.

Huntley declined to say whether the roommate is a suspect in the case. However, police believe the victim, the roommate and Beitz are the only three people involved in the incident, which involved alcohol.

Police are waiting to talk to the victim, who had surgery Saturday for a single stab wound to his mid-section. The victim's injuries are not considered life-threatening.

His name has not been released because the case is still active, Huntley said.

Anyone with information can call police at 303-441-3333.