Foreign Minister Julie Bishop says families are key to helping prevent the radicalisation of youths after the fatal shooting of a police worker in Sydney.
"When a 15-year-old boy can be so radicalised that he can carry out a politically motivated killing or an act of terrorism, then it's a time for the whole nation to take stock," she told ABC television on Sunday.
The minister believes families will be crucial in a defence strategy against radicalised youth.
She said a holistic approach must be taken to include families and Muslim community representatives.
Islamic leaders were part of a phone hook-up with Prime Minister Malcolm Turnbull, NSW Premier Mike Baird, federal and NSW police on Saturday.
"It's the families that will be our frontline of defence against radicalised young people, so we will be working very closely with them," Ms Bishop said.
"No one level of government or no one section of community can do it all alone."
Detectives are continuing to investigate the motive behind the fatal shooting of a police worker outside the force's Sydney headquarters by a radicalised teenager.
Only scant details have emerged about the 15-year-old who shot and killed Curtis Cheng (pictured below) as he left work at the State Crime Command on Friday afternoon.
Police have refused to confirm his identity until they've completed "all formalities" but he has been named in media reports as Farhad Khalil Mohammad Jabar of Iraqi-Kurdish background and born in Iran.
Commissioner Andrew Scipione says investigators are still a long way from establishing a full picture of the teen but "his actions were politically motivated and therefore linked to terrorism".
At this early stage, Mr Scipione says his investigators have no information to tie the boy to a specific group.
A beefed-up police presence is expected at Sunday's NRl final.
