Morro Bay Police say an 18-year-old man was arrested Tuesday night after he allegedly tried to rob someone at knifepoint. Authorities say it happened at the Fireside Inn on Morro Avenue just before 9 p.m… Witnesses told police Armando Benjamin Ayala had attempted to rob another man. The two men fought and suffered non-life threatening injuries. Ayala was arrested on suspicion of assault with a deadly weapon and attempted robbery. Bail was set at 60,000 dollars.