3AW | 'Don't be alarmed': New terror warning speaker system tested in Melbourne 9news.com.au A new emergency loudspeaker system will ring out in Melbourne's CBD this morning as police conduct a terror attack drill. Police will test the system, which will be used during class three emergencies like terrorist attacks, hijacks, sieges or riots ... Emergency warnings to sound in Melbourne CBD 'Don't be alarmed': CBD sirens to sound in emergency system demo Melbourne's terror speaker system tested |