SIOUX FALLS, S.D. (AP) — Three teenagers from Minnesota were beaten with a gun at a bar in Sioux Falls, which caused severe head injuries to one of the victims, police said.

Sioux Falls police spokesman Sam Clemens said the assaults took place Sunday about 1 a.m. at an unnamed bar where two boys and a girl were threatened with a gun after an altercation with two men.

The three were then beaten with the gun, Clemens said. The teens were transported to the hospital with injuries. The youngest teen, a 15-year-old boy, suffered serve head injuries that required staples.

The other victims include a 16-year-old boy and 17-year-old girl. Their hometowns were not released.

Clemens said police are not sure how the three underage teens got into the bar.

The two suspects were not found.

By — Nick Ursini