Homicide detectives responded to the scene on Bergano Place at about 3 a.m. They found a woman and a young girl dead inside the home. A third woman was injured and was brought to a hospital.
Authorities were releasing few details, but neighbors say the deceased are an 8-year-old girl and her mother, and the injured woman is the little girl's grandmother, and that they had all been stabbed.
San Bernardino County Sheriff's Department investigators are searching for a suspect. The motive for the attack and whether the victims were known to the attacker remains under investigation.