The Arlington bank robber has struck again, hitting a BB&T bank branch on Washington Boulevard this week for his sixth heist in three months, police say.

The suspect. (Arlington police. )

There were just three robberies in the county in all of 2010.

The man he hit a BB&T Bank in the 3000 block of Washington Boulevard at about 2:15 p.m. on Tuesday, demanding cash from a teller, police said.

He is described as white and about 50 years old with brown hair, and a thin build; he stands about five-foot-nine, authorities say. During the latest robbery he wore a gray t-shirt, khaki pants, brown belt, a light-colored hat and sunglasses, according to police.

Police ask anyone with information about the case to call the tip line at 703-228-4242 or Detective Donald Fortunato at 703- 228-4197. Fortunato can also be reached by