Authorities say the suspect walked into the convenience store at 3230 Richmond Street a little before 3 a.m. on Saturday, Nov. 26 and approached an employee behind the counter.
Brandishing a small needle, the suspect demanded money from the cash register before fleeing the scene on foot, detectives said.
It's not known how much money he got away with, and no workers were harmed during the robbery, police added.
To identify the suspect or to leave an anonymous tip, call or text 215-686-8477.
Click here to follow Daily Voice Bristol and receive free news updates.