Police say there have been no injuries reported, but they are investigating, after reports of a "grenade-shaped object" in the toilet of a building near Bay and Wellington.
Cops were called just before two on Tuesday afternoon.
They couldn't say exactly what the object was, but the bomb squad has been called in to investigate.
The building at 181 Bay, houses a Japanese restaurant, as well as several stories of offices overhead.
Police say there's been no evacuation order given.
Kym Geddes