Police are looking for an armed man they say robbed banks in Reston and McLean on four occasions in barely a month. In each robbery, police say the suspect was carrying a handgun, and in one case he struck a bank employee.

The suspect is described as a black male, 5 feet 6 inches to 5 feet 10 inches tall and about 250 pounds. His face was covered. He was wearing a dark-colored sweatshirt, bluejeans and black gloves in the first robbery and black clothing in the second.