A man robbed the Marathon gas station on West Avenue earlier tonight.  He escaped on foot and is feared to be on the loose in Crossville. Suspect is wearing a black hat, a tan CarHart jacket.  Suspect took off running down Parks Street on foot. Crossville Police and Sheriffs Deputies are currently searching for the robber.  Area residents are advised to keep all doors locked and report immediately any sightings of the robber to 911.