San Luis Obispo police are investigating a robbery at the Rite Aid store on Johnson Ave.
It happened at about 8:50 p.m. on Tuesday.
Police say a caller reported that a man had entered the store, threatened a cashier, and demanded money from the register. The man was last seen getting into a car and leaving the area.
Investigators say he made off with some cash and a stereo speaker.
No one was injured.
The robber was described as approximately 20-years-old with a thin face. He was wearing a black beanie, gray hooded sweatshirt with black sleeves, blue jeans, gray and white shoes, black and white gloves, and he had a black mask.
Police say officers searched the area but were unable to locate the suspect.
Anyone with information about this crime is urged to call the San Luis Obispo Police Department at (805) 781-7312 or Crime Stoppers at (805) 549-STOP.