Lebanese authorities say they have arrested an 18-year-old Australian man suspected of trying to travel to Syria to fight for Islamic State.
A Sydney teenager, suspected of trying to travel to Syria to fight for Islamic State, has been arrested in Lebanon and has provided details of other Australians linked to the militants, local officials say.
The Lebanese Internal Security Forces said in a statement it had arrested a Lebanese-Australian man, who had lived in Sydney for several years "and embraced extremist ideology".
The ISF said the man, born in 1999, had become radicalised by watching and reading online material from the terror group and arrived in Lebanon on August 20.
"After his arrival in Lebanon he continued with members of 'Daash' in Syria via the internet," the ISF statement said.
The statement added the teenager was detained two days before he was due to depart for Syria and had given up information on other Australian fighters, and supporters and financiers of the militant group.
The ISF claimed the Australian man was linked to an IS co-ordinator in a neighbouring country.
The teen will face a local court at a future date, the statement added.
The Department of Foreign Affairs and Trade confirmed it was providing consular assistance to an Australian man detained in Lebanon, but would not provide further comment.