The incident occurred on the 3900 block of Genevieve Street. Police said officers responded to shots heard in the area just after 11 p.m. Tuesday.
When authorities arrived on, they found three victims. One was pronounced dead at the scene and another died after being transported to a local hospital. Both victims were 22 years old and from San Bernardino.
As police conducted their investigation, they found a third victim, a 21-year-old San Bernardino resident. He was taken to an area hospital where he was said to be in serious condition.
There was no word on a motive and police had no suspects in custody.
If you have any information regarding this incident, you're urged to contact San Bernardino police at (909) 384-5742.