Two teenagers - one of them related to a convicted terrorist - are behind bars accused of planning a brutal Islamic State-inspired attack on the streets of southwest Sydney.
One of the boys is alleged to have been planning to do "something bigger" than the murder of Curtis Cheng for the past year.
The boy, 16, was intercepted on a police wire in October last year talking to his mother, just days after the NSW Police accountant was killed, court documents reveal.
"When they come, I'm going to do something to them that they have never seen before," he allegedly said.
"I'm going to do something bigger."
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Police will claim the boy was drawing comparisons between himself and teen terrorist Farhad Jabar, who fatally shot Mr Cheng outside NSW Police headquarters in Parramatta.
He and another 16-year-old boy are now in custody after facing court on Thursday for allegedly possessing M9 Bayonet hunting knives in preparation for a terrorist act.
The pair were formally refused bail at Parramatta Children's Court and their cases adjourned until December 7.
They were arrested by counter-terrorism police the day before outside a Bankstown prayer hall after allegedly purchasing the combat weapons from a nearby gun shop.
One boy allegedly had a handwritten note pledging allegiance to IS in his possession when he was arrested, according to court documents.
The teen, whose relative is serving time for terror offences, allegedly took part in a Hyde Park protest in 2012 carrying a sign that read "Behead those who insult the prophet".
The other was previously caught overseas trying to enter "an area under control of a terrorist organisation", police will allege.
He was found in possession of electronic IS literature on his return to Australia.
Authorities were unaware of any specific targets, but believed an attack was imminent.
The teens have each been charged with planning an act of terror - which carries a penalty of life behind bars - and being members of a terrorist organisation, which carries a penalty of 10 years' prison.
Four western Sydney properties connected with the teenagers - including a prayer hall and multiple homes - were raided after the boys were taken into custody.
Police have not ruled out further arrests.
