The premier of New South Wales state Barry O'Farrell declared a state of emergency.
The fires have killed one man, destroyed a total of 208 homes in New South Wales state and damaged another 122 since Thursday, the Rural Fire Service said.
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The soldiers who trained there left their names and messages on the walls of the tunnels.
Researchers were shocked to find the so-called Sussex Declaration hidden away in a record office.
The Hollywood star reportedly looked like he "switched into superhero mode" as he chased the suspect near his home.