Sydney terror suspect detained in Lebanon

An Australian teenager, suspected of trying to travel to Syria to fight for Islamic State, has been arrested in Lebanon, 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 statement said.

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.

The ISF claim the Australian man was linked to an Islamic State co-ordinator in a neighbouring country.

He was arrested two days before his planned departure, according to the ISF.