They say at around 5:24 p.m. on Wednesday, they received a call about a bank robbery at Bayport Credit Union in the 8000 block of Marshall Avenue.
They say the suspect handed the teller a note and left with an undisclosed amount of money.
He did not display a weapon police say.
They say several customers and employees were present during the robbery.
If you have any information about this case, please call the Crime Line at 1-888-LOCK-U-UP.