Tennessee ? A gunman took a taxi to a hospital and gave the cab driver $20 to wait, then opened fire Monday in an area where patients are released, killing one woman before committing suicide.

Two other women were injured in the shooting, and all the women were current or former employees of Parkwest Medical Center, Knoxville Police Chief Sterling Owen IV said. The attack happened about 4:30 p.m. outside the hospital’s discharge area.

Police are still trying to determine a motive, but it did not appear that any of the victims were related to the suspect or that there was any connection between them, spokesman Darrell DeBusk said. Police also don’t think the suspect was ever employed at the hospital.