A female subject ran into the station and reported that a male subject tried rob her of her purse and also tried to stab her. This occurred topside, on New Montgomery and Market streets. The suspect was described as a black male, 38-45 years of age, black jacket and carrying a black bag. The knife was described as silver with a 4-5 inch blade. A BART Sergeant and Officers responded along with SFPD. A search was conducted with negative results. SFPD took the case.