All three victims were wounded shortly after 6 p.m. Monday near 105th Street and Denker Avenue, the Los Angeles County Sheriff's Department said.
The victims were described as two adults and one juvenile -- a 7-year-old girl.
They were rushed to the hospital. Sheriff's officials said the little girl's injuries were not life-threatening. The conditions of the two adults were not known.
Detectives found multiple bullet holes in a white Infiniti at the scene and multiple bullet casings in the street.
Investigators said the shooting was gang related.