A British teenager on Thursday admitted to inciting an Islamic State-inspired attack on police officers during an Anzac Day parade in Melbourne as part of World War I anniversary commemorations this year.
The 15-year-old, who was 14 when he was arrested, sent thousands of instant messages to Australia-based 18-year-old Sevdet Besim over a 10-day period, prosecutor Paul Greaney told the court.
"Those messages reveal the intentions of the plotters and their targets, along with their motivation, which may be summarised as support for ISIS and their enthusiasm for the attack," Greaney said.
The bespectacled teenager, who wore a grey shirt and tie, cannot be named under English law because of his age.
He entered his guilty plea at the hearing at London's Central Criminal Court, the Old Bailey, via video link from a court in Manchester, northwest England.
The boy, who was arrested in nearby Blackburn on April 2, is to be sentenced on September 3.