Officials said one person was killed and two others were wounded on the tribal lands near Palm Springs.
Officials said the shooting happened around 11 p.m. Wednesday and confirmed the incident was not near the popular casino.
Sheriff's officials said there were no outstanding suspects and there was no threat to public safety.
Both the Riverside County Sheriff's Department and tribal police are involved with the case.
An investigation into the shooting remained ongoing.
#Homicideinv Morongo Indian Reservation RSO homicide investigators are on scene, no outstanding suspects and no threat to public safety. Investigation ongoing. No further details for release at this time, press release to follow.— Riverside County Sheriff Media Info Bureau (@RSOmedia) January 11, 2018