The former president of the Northern Territory Labor Party has been detained at Darwin Airport after returning from the Middle East.
It's believed Matthew Gardiner left Australia this year to join Kurdish forces fighting Isis (Islamic State).
He was stopped by Customs officials at Darwin Airport early yesterday after flying from the Middle East through Sweden and Singapore, the ABC reports.
The Australian Federal Police say they have spoken to a Darwin man on his return to Australia.
"Inquiries relating to his activities while overseas are ongoing and as such it is not appropriate to comment further at this time," the AFP said.