The victim, identified as 48-year-old Charita Zamora, was struck near the intersection of Beach Boulevard and Bolsa Avenue at about 7:30 p.m. Tuesday while standing on the sidewalk waiting for a bus.
The SUV slammed into Zamora, and then hit a power pole. The crash damaged the pole, but no outages were reported.
"She received serious injuries, a broken arm and head lacerations," said Sgt. R. Mize of the Westminster Police Department.
Stunned witnesses immediately dialed 911, while the driver and three passengers fled the scene. The SUV had been stolen last week in a home burglary.
"Additional officers that were arriving on scene saw suspects running down Beach Boulevard. They called for additional resources, and we were able to set up a perimeter in the area," said Sgt. Cameron Knauerhaze of the Westminster Police Department.
Police detained two men, but they were released because authorities couldn't confirm they were in the SUV.
The four suspects, believed to be in their 20s, remain at large. The driver was wearing a red University of Southern California sweatshirt. The others were wearing dark clothing.
Authorities said Zamora was in stable condition at a local hospital.
Anyone with information was asked to call Westminster police (714) 898-3315.