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State police in Greensburg are investigating an armed robbery.It happened Monday afternoon at the Exxon Buy N’ Fly mini mart in the village of Herminie, Westmoreland County.A guy walked into the store at about 3 p.m. armed with a hatchet. He wore dark cloth wrapped around his face, looking like a mummy.No one was injured, and the suspect escaped with an undisclosed amount of cash.One resident of Herminie told KDKA-TV she thought the suspect might be someone local.“Everyone knows each other [in town], we know each other’s business, so, it’s kind of hard to get into trouble, without someone knowing what you’re doing,” she said.Another resident attending a local neighborhood crime watch meeting at the public library in Herminie said he was surprised the suspect brandished a hatchet.He speculated, jokingly, that perhaps his face was wrapped in cloth, “because he was cold.”The suspect wore a red hooded sweatshirt and is believed to be white male between 5-feet 5-inches and 5-feet 9-inches tall. State police say the man is in his 30s and had several missing teeth.State police ask anyone with information to call 724-832-3288.