Las Vegas police Lt. Jay Roberts said a suspect is in custody. The victims were taken to University Medical Center, although the conditions of the injured people were not immediately available.
Roberts says the shooting happened about 5:45 a.m. Monday at Drai's, an afterhours club that caters to those who have wrapped up their nights at other hotspots. It's located in the lower level of Bally's.
Gambling continued in the casino after the shooting, but yellow crime scene tape stretched around several banks of slot machines outside the nightclub. Debris littered the floor as uniformed casino and police officers investigated.
The Strip was the scene of a dramatic shooting and explosion just this past winter. Authorities say verbal sparring erupted into a shooting, chase and crash that left three people dead in February. A death penalty trial is set for Dec. 2 against a man who once bragged about his lifestyle as a pimp.