Authorities believe that one man committed two bank robberies in the District this month.

The first robbery took place on May 16 at the PNC Bank located at 4100 South Capitol St. SE. A man entered the bank, approached a teller and passed a note that demanded money and implied he had a weapon. The robber obtained an undisclosed amount of cash and left the bank on foot, according to the FBI.

Four days later, a robbery took place at the Citibank located at 3917 Minnesota Ave. NE. During that incident, the man also passed a teller a note demanding money and implying a weapon. He then left the bank on foot after obtaining cash, authorities said.

The robber is described as a tall black man in his 20s or 30s with short facial hair.

In the May 16 robbery, he was wearing a white hardhat, a red long-sleeved shirt, blue jeans and dark-rimmed glasses. In the May 20 robbery, he was wearing dark glasses, a dark jacket with a white T-shirt underneath, and a blue Washington Nationals baseball cap with a white "W" on the front.

Anyone with information can call the FBI at 202-278-2000 or D.C. police at 202-727-9099.