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WALDORF, Md. (WUSA9) -- Police are looking for a man in connection with an armed robbery at a 7-Eleven.

Charles County Sheriff's detectives say that at about 2:30 a.m. on July 18, the suspect entered the store in the 2800 block of Crain Highway in Waldorf.

He was wearing a mask, displayed a gun and demanded money and cigarettes. The clerk complied and the suspect fled on foot, officials said.

Investigators are asking anyone with information about the suspect's identity to call Det. Celia at (301) 609-6518. Callers wishing to remain anonymous may contact Crime Solvers at 1-866-411-TIPS or Text CHARLES + your tip to CRIMES or visit www.ccso.us to submit a web tip. A reward of up to $1,000 is being offered