A 15-year-old boy has pleaded guilty at the Old Bailey to inciting terrorism by encouraging the murder of police officers during an Anzac Day parade in Australia.
The youngster, who cannot be named for legal reasons, entered his plea via video link from Manchester Crown Court.
Wearing a grey shirt and tie, the boy spoke only to plead guilty.
The charge states that between March 15 2014 and March 26 the boy from the North West of England incited a person to commit an act of terrorism wholly or partly outside the UK, namely the murder of police officers during an attack on a parade to commemorate Anzac Day in Australia.
A second charge of inciting terrorism overseas in relation to beheading a person in Australia was dropped by the prosecution.
The court heard how the boy was 14 at the time he was communicating with 18-year-old Sevdet Besim in Australia via thousands of instant messages.
They had a shared intention through their support for IS, the court was told.
On March 18, the boy sent a message saying "suggest you break into someone's house and get your first taste of beheading".
The response was that "seemed a little risky".
Mr Justice Saunders ordered pre-sentence reports in particular to find out if there was any "indoctrination".
He said: "I want some assessment of how and why it occurred and what measures could be taken in order to reverse that process.
"Dealing with someone of this age is an extremely difficult sentencing process and I will need all the help I can get."
The boy is currently being held in an unidentified youth detention centre in the north west of England.
Sentencing was adjourned to September 3 at Manchester Crown Court.