Police say the suspect grabbed a woman walking along Sunnyoaks Avenue near Winchester Boulevard just after midnight Thursday.
The suspect reportedly pulled the victim behind a car and started to sexually assault her, when she burned him on the left cheek with a cigarette. It is believed that the suspect may now have injuries associated with the burn.
Police say he threatened her with a gun, tried to rob her, then ran away. The victim flagged down a passerby who chased the suspect. He was last seen running northbound in an alleyway on Sobrato Drive.
Anyone who may have witnessed the event or recognizes the suspect is asked to contact the Campbell Police Department Investigations Unit at 408-871-5190. Those wishing to remain anonymous can also contact the Silicon Valley Crime Stoppers at 408-947-STOP (7867).