Two men have been arrested in Sydney and will be charged with terrorism offences linked to a possible attack on government buildings.
It follows raids in the suburbs of Bankstown and Merrylands as part of the ongoing Operation Appleby into the alleged planning of a terrorist attack in Australia, The Guardian reports.
New South Wales police deputy commissioner Catherine Burn named the Australian federal police headquarters and a navy base in the east among the alleged targets.
However, she would not say how the men may have been involved.
Ms Burn said the alleged plot wasn't a "specific act, a specific activity".
"What we will be saying is there was a group of people who came together with the idea, with the intent to do something and they started to make preparations to carry out a terrorist act," she said.
She believes police intervened before the alleged plot became more concrete.
The charges stem from handwritten documents seized from a Wiley Park home in December 2014, which mention a number of locations.
The two men arrested were aged 20 and 24.
They join a number of other men charged with conspiracy earlier this month.