Officers were dispatched to the 100 block of Coloma Way on a report of a stabbing at about 1 a.m. No victims were found.
A short time later, officers stopped a vehicle on Sonoma Boulevard at Lewis Brown Road. Two people, Monette Boniafacio, 25, and 20 year-old Russell Sevilla, were inside with stab wounds, according to police. Both people were transported to a local hospital.
A third victim, Valentino Abasolo, 21, walked himself into a hospital.
Anyone with information about the stabbings is asked to call Detective John Whitney at (707) 651-7105 or (800) 488-9383.