The Australian Federal Police has warned of an increase in home-grown terrorism threats as the conflicts in Syria and Iraq continue to radicalise Australians.
Of significant concern is the increasing number of Australians travelling overseas to participate in the conflict or who are planning attacks in Australia, the AFP says in its annual report for 2014/15.
"The AFP continues to experience a significant rise in operational activity that can be directly attributed to the conflicts in Syria and Iraq," it said.
"This level of activity is anticipated to continue to increase as the number of Australians seeking to support the conflict continues to grow."
The AFP says returning fighters may have become further radicalised, trained and motivated and capable of conducting terrorism-related activities in Australia.
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As well, those remaining in Australia, including some prevented from leaving, may themselves become radicalised.
They could plan attacks, seek training from those who return and engage in criminal activity to provide financial support.
There's high potential for Australia's international reputation to be damaged if Australians become involved in overseas terror attacks.
The AFP says there's also significant concern about citizens of regional countries supporting extremist groups.
That could result in expanded international extremist networks and enhanced capability and motivation for international jihad.
"This places Australians at greater risk of a terrorist attack while travelling in South East Asia," the agency says.
During 2014/15, the AFP conducted eight operations aimed at disrupting terrorist activities, charging 25 people.
