Teenager Sevdet Besim has pleaded guilty to planning an act of terrorism targeting ANZAC Day commemorations in Melbourne last year, including plotting to run down and behead a police officer.

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The 19-year-old from Hallam, in Melbourne’s south-east, was arrested in counter-terrorism raids a week before the public holiday in 2015.

But he has now changed his plea to guilty after his latest hearing in the Victorian Supreme Court.