The holdup occurred inside a 76 gas station located on La Palma Avenue and Walker Street around 9:30 p.m. Monday.
According to police, the suspect walked into the gas station with a weapon and ordered the gas station clerk to quickly open the cash register. Once the man did as he was ordered, the suspect fled with about $500 in cash.
Surveillance video shows the suspect ordering the gas station employee to the floor before fleeing the scene.
The suspect was described as a black male. He was last seen wearing dark colored pants, a jacket, black and white shoes and a baseball cap with a red bill and logo on the front.
Anyone with information regarding the suspect or robbery was urged to contact La Palma police at (714) 690-3370.