A Sydney teenager with special needs is accused of posting about killing a police officer and creating an "attack map" in preparation for a terrorist act.
The 17-year-old, who cannot be named for legal reasons, was charged around midnight on Tuesday after police were alerted to his social media posts.
His matter was mentioned in the Parramatta Children's Court on Wednesday where it was adjourned until Thursday. Bail was not applied for.
In court documents, police allege the boy created a map and deleted hard drives in planning for a terrorist act.
Police Commissioner Andrew Scipione told reporters he had also talked about killing an officer in social media posts.
The boy was arrested from his home at The Oaks, west of Camden, before being charged by the NSW Joint Counter Terrorism Team with preparation for planning a terrorist act and using a telecommunications network with intention to commit a serious offence.
At a media conference in Sydney on Wednesday Mr Scipione implored officers to remain vigilant following the threat.
"Late last night, we put a warning out to our police again on the back of the most recent advice we've broadcast, that we know police and security services are currently targets," he said.
Mr Scipione said the teen has no known connection to any previous terror activity.
The commissioner said he expected the court to take into account the boy's special needs.
He declined to answer if a weapon was referenced in the social media threat.
"At this stage we need to bear in mind he does have special needs but this is now a matter that will be before the courts and we expect the courts will take all of that into account," he said.
"You cannot afford not to respond."
Police Minister Troy Grant said all threats to the safety of police or the public were concerning.
"As we've seen across our shores, terrorism in all shapes and sizes is a massive challenge," Mr Grant said.
"We've seen groups of people with planned and orchestrated attacks and we've seen the lone wolf individual type of attacks so we will always need a wide range of access to technology and intelligence and partnerships."
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