At least three people were killed in a shooting at an Oklahoma City bar Saturday night, police said.

Three others were injured. One person was in critical condition and two others suffered non-life-threatening injuries, Oklahoma City police Lt. Jeff Cooper said.

The circumstances of the shooting at the Whiskey Barrel Saloon, a bar and restaurant southwest of downtown Oklahoma City, were unclear, he said.

Officials did not provide details on a suspect and detectives were trying to determine what precipitated the shooting.

Police alerted the community to the situation shortly before 10 p.m. in a Facebook post, but it was unclear exactly when the shooting was reported.