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A masked man armed with a gun robbed a convenience store in the 1400 block of East Chicago Street early Saturday morning, Naperville police said.

The suspect entered the store about 3:55 a.m., displayed a handgun and took cash and cigarettes, a news release said.

The clerk, who was not harmed, told officers the man fled south on foot but police could not locate him despite an extensive search of the area, the release said.

Described as being in his early 20s and having a thin build, the suspect was was wearing a hooded sweatshirt and light shoes. He was carrying a dark-colored backpack, the release said.

Anyone with information on the case is asked to contact Naperville police at 630-420-6666 and ask for the investigations division.