A shopper at San Francisco's Stonestown Galleria was left shaken and injured this weekend, after an aspiring mugger tried to swipe her purse.

According to the San Francisco Police Department, it was 4:30 p.m. Saturday when a 26-year-old woman walked through the parking lot of the Stonestown Galleria, located at 200 Winston Drive in San Francisco.

Suddenly, police say, a man who appeared to be about 18 years old pushed the woman to the ground and "began tugging" at her purse.

The suspect was so eager to wrest the bag from her grasp, police say, that he punched the woman as she lay on the pavement. However, a witness to the attack then intervened, yelling to the miscreant to end his evil act.

Apparently frightened by the attention cast toward his disturbing behavior, police say the suspect "got scared and fled to a waiting car," driven by a male witnesses say looked to be around 16 to 17 years old.

The victim suffered scrapes to her knee and bicep, as well as some wrist pain, and was treated at the scene, according to the SFPD.

The vehicle, which police say was a white, four-door Ford Taurus, headed in an unknown direction. As of Monday morning, the suspects remain at large.