An anonymous patron reported seeing a subject place a gun inside his backpack and enter the station. Officers responded and entry into the station was temporarily suspended and trains were held out. The officers searched the platform level of the station and detained a subject who matched the description (Holmes, Aubrey, 4/30/78). The subject was taken into custody without incident and found to have a toy gun laying nearby on the platform. The subject was released after it was determined he committed no crime.