The off-duty officer was involved in a minor crash on Interstate Highway 280 and pulled off the freeway with the other car at about 12:10 a.m., Officer Albie Esparza said.
Esparza said the two cars stopped in the area of Jerrold Avenue and Bayshore Boulevard and got into a physical altercation. The altercation escalated to a point where the female officer discharged her weapon, striking the person in the lower body, Esparza said.
The person, whose age and gender was not immediately available, refused medical attention. The injuries are not considered life-threatening, Esparza said.
Esparza said he did not know if the person had a weapon, or what provoked the off-duty officer to discharge her weapon. Esparza said the shooting is under investigation. The officer will be placed on paid administrative leave during the investigation.