Victorian Police have confirmed that a busker doing "breathing exercises" and carrying a duffel bag was the cause of the "suspicious behaviour" scare at Flagstaff station this morning.
The station was shut down just after 8.30am with police responding to reports of a man carrying a gun in a bag.
Trains travelling through the CBD station were told to skip the stop completely in order to clear the area, with other trains running direct to Flinders Street.
Police searched the area and no firearm was found.
Earlier on Triple M
Flagstaff Station evacuated and all city loop trains diverted due to police operation