The FBI and Alexandria police are searching for information about a bank robber who might be one of several suspects involved in more than a dozen cases since 2008.

Authorities released security images of the robber entering the Capital One Bank branch on South Washington Street in Alexandria at about 9:45 a.m. on Oct. 20, 2010.

The man, whose face is visible as he walks through the front doors of the bank, pulls a mask with black hair out of his pocket while entering the bank, puts it on, and pulls the hood of his sweatshirt over the back of his head before approaching the teller and demanding money.

The man was given an undisclosed amount of cash before leaving the bank on foot.

Authorities suspect the man has been involved in multiple bank robberies in Northern Virginia over the past four years, and might be associated with other unknown criminals in the area who use masks while robbing banks.

"We're working with local police in Northern Virginia to try and develop [a modus operandi] and figure out if this is the same person and the same crew," said Lindsay Godwin, spokeswoman for the FBI's Washington Field Office.

The man is described as black and having a medium build, with a short beard, and is pictured wearing a red zip-up hooded sweatshirt and gray sweatpants.

Anyone with information about the case is asked to call the FBI Violent Crimes Task force at 202-278-2000 or the Alexandria Police Department at 703-746-4444.