An armed robber struck a gas station in Mattoon on Tuesday, making off with an undisclosed amount of money, according to authorities. The Shawano County Sheriff’s Department received a call at about 8:24 p.m. from Donna’s Village Pump, 1203 Fourth St. in Mattoon, advising that the station had just been robbed. The caller stated a white male approximately 6 feet tall wearing camo and a ski mask entered the store carrying a gun, according to Sheriff Adam Bieber. The suspect demanded the clerk, who was alone in the store, give him all the money, Bieber said. Anyone who was in the area and might have seen anything or has any information is asked to call the sheriff’s office at 715.526-3111. The incident remains under investigation.