A patron to the station agent at 16th St. Station reported that there was a male subject on board an SFO train threatening patrons with a meat cleaver. The incident train car held at the Glenn Park Station while BART and SFPD officers responded Code 3. The officers searched the incident train car and a witness flagged them down and pointed out the suspect. The officers took the suspect into custody without incident and located 2 kitchen knives (3” blade) on his person and on his backpack. Investigation into the matter revealed that the suspect did not brandish the knife at anyone, but that he was holding it as he was mumbling profanities to himself. The suspect was deemed a danger to others so he was transported to the SF General Hospital for psychiatric evaluation. A lieutenant responded to conduct a use of force investigation. TSOC was notified.