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WOODBRIDGE, Va. (WUSA9) -- Police are looking for a man who reportedly ran off after trying to rob an Exxon service stationin Woodbridge, Va.last Friday.

According to police,shortly before 6:15 p.m. Friday, a man entered the service station at 13000 Worth Ave, displayed a knife, and demanded money. An employee screamed and the man ran away without getting any money, say police.

The man was described as a white male, between 30and 35 years old, 5'10" tall and 170 poundswith amedium build. He had black, thinning hair and an unshaven face, say police. Police say he was last seen wearing a black jacket, blue jeans, and black running shoes.