Three people — two women and a man — were dead, and another man was taken to hospital in serious but stable condition, police said.
The shooter or shooters appeared to be at large.
Police used geo-targeted text messages to urge the public to avoid the area and for local residents to stay inside and contacted.
The shooting comes on a National Day of Mourning as Australia remembers the 15 people shot dead in Sydney at a Hannukah celebration on Dec. 14.
Authorities say the two alleged Sydney gunmen were inspired by the Islamic State group to carry out Australia's worst mass shooting since 1996.
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