A suicide bombing in Syria by a man thought to be Australian highlights the risk posed by Australians taking part in the conflict, a former Labor minister says.
Former attorney-general Mark Dreyfus says it is a concern that Australians were participating in a "truly dreadful" conflict where barbarities were perpetrated by all sides.
"Australians who are exposed to that kind of activity, who become radicalised, who become trained in that kind of military activity, it is of course a concern that they might bring back to Australia that kind of knowledge," he told ABC television's 730 program.
During the program a bomber, identified by the ABC as a 27-year-old man from Brisbane, is shown in an online video posted by al-Qaeda-linked group Jabhat al Nusra.
The man, his face pixelated but identified as "Abu Asma al Australi", stands on the back of an explosives laden dump truck reciting passages from the Koran, urging others to participate in jihad.
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The truck is then pictured driving away and exploding in the distance.
This occurred in September. Jabhat al Nusra claimed it was driven by the man and said he died in the blast that also killed 30 Assad government soldiers.
However, the man's brother told the ABC it was not true. He said his brother was alive in Turkey, doesn't agree with the war and could not speak fluent Arabic like the man in the video.
A number of Australians have died in the Syrian conflict, all apparently fighting with rebel groups.
In its annual report, ASIO warned of an increasing number of Australian Muslims travelling to Syria to fight - with the risk they could return radicalised and with skills to mount terrorist attacks.
Mr Dreyfus said this was why he proscribed Jabhat al Nusra as a terrorist organisation earlier this year.
That prohibits Australians from joining or participating in any of its activities in Australia or overseas.
Where the government knows a person is intending to participate in the Syrian conflict, it can cancel a passport.
"But of course it's not always possible to determine in advance that someone is intending to participate. They might, for example, state their destination as Turkey," he said.
