An emergency loudspeaker system used to direct the public during terror attacks in Melbourne's CBD has been tested - with little response from the public.
Police tested the system - to be used during class three emergencies like terrorist attacks, hijacks, sieges or riots - at the State Library on Swanston Street around 11am this morning.
"This new tool is a quick way for us to alert the community of any imminent risks and ensure their safety," Acting Chief Commissioner Shane Patton said.
But despite the sirens - it seems the public had little reaction to the alert.
Mr Patton said the speakers were just one way police would communicate to the public during an emergency.
"We can also communicate via SMS and our social media pages, which would be regularly updated during an incident," he said.
Sixty-five speaker sets have been installed at sites including Federation Square, Flinders St Station and the Bourke Street mall, with more than 90 sites to be completed by the end of 2018.
Sydney has had emergency speakers in place since before the 2007 APEC meeting and other cities around the world use similar warning systems.