Authorities say the man entered the Citizens Bank branch along the 8600 block of Germantown Avenue shortly after 4:00 p.m. Friday.
The man handed a teller a note indicating he had a bomb; it turned out he did not.
Before the man could get any money, he fled the bank on foot.
The man is described as white, in his mid-20's to late-30's, 6'2, about 160 pounds, and he was wearing a blue New York Yankees baseball cap.
It was also noticed the suspect was walking away with a limp.
Anybody will information is asked to call the police.
No one was hurt in the incident.