A 15-year-old British boy has admitted encouraging an Islamic State-inspired terror attack targeting police officers at an Anzac Day parade in Australia.

Over a 10-day period the youngster from Lancashire sent thousands of instant messages to 18-year-old Sevdet Besim, who shared his admiration for the Islamic terror group, the Old Bailey heard.

In one message on March 18 this year, the British boy, who was 14 at the time, said: "Suggest you break into someone's house and get your first taste of beheading."

Besim replied that it "seemed a little risky", prosecutor Paul Greaney QC told the court.

The smartly dressed, bespectacled British youngster pleaded guilty to inciting terrorism via video link from Manchester Crown Court.

The charge states that between March 15 and March 26 2015 he "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".