Help Us Identify this Suspect; Verizon Store Robbery, 5/15/14

Help detectives identify the suspect in this video:

ARMED ROBBERY, 6300 Springfield Plaza, 5/15/14. A 20-year-old employee of the Verizon Wireless store was robbed by a man after the store closed. Suspect bound the victim’s hands and took numerous cell phones. The victim did not require medical treatment. The suspect was described as black, 20 to 25 years old. He was about 5 feet 7 inches tall with black hair.