Authorities say the man showed a handgun and demanded money. He got away with some cash.
A witness says the robber ran across 16th Street. Police and search dogs scoured the area, but came up empty.
Witnesses say the robber is a black man around 18 to 22 years old, about 5'7 and weighing around 200 pounds. He was wearing a red baseball hat.
If you have any information, contact the Wilmington Police Department.