Officers responded to reports of a shooting at Bi-Rite Market on MLK Jr Way shortly before midnight.
When they arrived, they found a person who had been shot, who was rushed to the hospital.
A short time later, a second person who had been shot arrived at Mercy Medical Hospital for treatment.
Police say both victims are expected to be OK.
A motive for the shooting has not been released and a description of the suspect was not provided.
Investigators are asking anyone with information to call 209-385-6998.