A threat that prompted the evacuation of Sydney's Town Hall train station and hours of major train delays is a hoax, police say.
NSW Police confirmed at 11.40am on Wednesday that an operation was under way, with train services through the busy station suspended.
Officers searched the station and surrounds, but about 12:30pm confirmed nothing had been found, allowing trains to resume.
The reason behind the operation is not clear.
Commuters caught up in the saga were urged to delay their travel, with major flow on delays still plaguing the train network hours later.
Buses are supplementing trains in some areas.
