Australian Prime Minister Tony Abbott says his Government is doing all it can to stop Australians travelling overseas to fight with extremists after revelations a Melbourne boy had been recruited by Islamic State.
An Isis fighter declared a "white jihadi" by the British press in December has been identified as an 18-year-old Melbourne man called "Jake" .
He was a good student at Craigieburn Secondary College then dropped out last year after converting to Islam.
The revelations come just days after two teenage brothers were stopped at Sydney airport by customs officials who suspected they intended to join the conflict in the Middle East.
The youths, aged 16 and 17, were detained on Friday after they aroused the suspicions of two customs and border protection officers, Immigration Minister Peter Dutton said.
