A 69-year-old Palo Alto woman says she suffered a concussion and broken kneecap after fending off an assailant outside the San Pablo Lytton Casino.

The victim, who asked not to be named, said she was leaving the casino about 8 p.m. Wednesday when a man she had spoken to at the casino's snack bar offered to walk her to her car.

The man, who she described as being well-dressed and in his mid-40s, quickly attacked her, the victim said. He put arm his around her and placed his hand under her bra before telling her to come with him to his car.

"I was in shock," the victim said. "I didn't know what to do. I yelled something at him, telling him to back off."

She said she struggled loose from the man and fell as she raced to her car, breaking her kneecap and hitting her head against the pavement. A good Samaritan jumped out of his car and gave her a tissue to wipe away the blood running down her face, she said.

The casino and San Pablo police did not return calls Saturday. Police confirmed to KTVU that they took a report on the incident at Doctors Medical Center in San Pablo, where the victim was taken after the attack.

The victim said a police officer showed her a surveillance camera photo of her struggling with the assailant. She recalls seeing a security guard posted outside the casino entrance and wasn't sure why the guard didn't rush to her aid. "Maybe he was looking the other way," she said. "But I'm surprised he couldn't hear me."

Contact Matthew Artz at 510-208-6435.