(WSET) – An 18-year-old has been arrested and another suspect is at large following an armed robbery, Roanoke County officials said. On Wednesday around 9 p.m., Roanoke County Police officers responded to a report of a robbery at the Stop In located in the 4000 block of Electric Road (Cave Spring area). Two subjects with faces partially covered entered the store presented a firearm at the clerk and demanded money, officials said.