It was the second time the business had been held up this month, Mill Creek officer Ian Durkee said.
The robber had approached a man working at the business shortly after 1 p.m., showed a handgun and ran off with an undisclosed amount of cash, Durkee said. Nobody was injured.
Authorities described the suspect as a white man in his 20s who stands about 5 feet, 10 inches, weighs an estimated 190 pounds and has a medium build. He wore a black bandana over his face, a white jacket with a hood, blue jeans and white shoes.
Anyone with information that might help police solve the crime is asked to call the Mill Creek Police Department's records office at 425-745-6175 and ask to speak to a detective.
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