Semi-automatic handgun found in suspect's car: Sheriff
San Mateo County Sheriff Christina Corpus said a semi-automatic handgun was found in the suspect's car.
![](https://s.abcnews.com/images/US/suspect-vehicle-_hpMain_20230124-014604.jpg)
The suspect, 67-year-old Chunli Zhao, is cooperating and being interviewed, the sheriff said.
Zhao is believed to have acted alone, Corpus said.
-ABC News' Marilyn Heck and Abigail Shalawylo