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UPPER MARLBORO, Md. (WUSA9) -- Police are investigating a robbery which took place a United States Postal Service office in Maryland on Wednesday.

The robbery happened around 7:00 p.m. at the USPS office located at 9801 Apollo Drive. A suspect went inside, demanded money from the postal worker on duty and left with an undisclosed amount of cash, police said.

No injuries were reported during the incident.

Police say the suspect is described as a black male, 5'7-5'9,' medium build, and was wearing a black jogging suit.

Anyone with information is asked to call the U.S. Postal Inspection Service at 877-876-2455.

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