The Nevada Department of Public Safety said the wounded victims were in surgery and one of them is a doctor.
Police initially said the gunman shot four people before killing himself, but they later said he wounded two people and killed another before committing suicide.
Department of Public Safety spokeswoman Gail Powell said the wounded doctor is a woman but she had no more information about the identity of the victims or the gunman, the type of weapon or a motive for the attack. She said the shooting happened at the Center for Advanced Medicine and Neurology of Nevada at Renown Regional Medical Center.
PREVIOUS: One person is dead and at least four others are injured in a shooting at a medical building in Reno, Nevada.
Authorities say a gunman went into a neurology office near the Renown Medical Center and opened fire.
The shooter reportedly shot several people before taking his own life.
Police continue to investigate.