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Teenager pleads guilty in Sydney court to planning terrorist attack on Opera House

A 16-year-old boy testified about online radicalization during a sentencing hearing following his guilty plea to planning a bomb attack during the Sydney Marathon.

The short version

  • A 16-year-old boy pleaded guilty in the New South Wales Supreme Court to planning a terrorist bombing targeting the Sydney Opera House during the Sydney Marathon.
  • The teenager testified that he was radicalized online through TikTok and Telegram starting at age 14, drawing inspiration from the 2013 Boston Marathon bombing.
  • Defense counsel requested a non-custodial sentence to allow continued deradicalization, while the crown prosecutor argued a custodial sentence is required.
  • Justice Stephen Campbell is scheduled to deliver the sentence on October 29.

Key facts

  • An unidentified 16-year-old boy pleaded guilty in the New South Wales Supreme Court to planning a terrorist act over a period of more than a month in 2024.[The Guardian]
  • The planned attack targeted the Sydney Opera House on the day of the Sydney Marathon, using the landmark finish line to maximize potential casualties.[The Guardian]
  • The teenager testified that he first encountered extremist content on TikTok at age 14 before communicating with extremists on Telegram.[The Guardian]
  • The boy has been under strict home detention bail conditions since November 2024.[The Guardian]
  • Defense lawyer Michael Valentin advocated for a non-custodial sentence, while Crown prosecutor Sophie Callan SC argued that custody is the only appropriate response.[The Guardian]

What remains uncertain

  • Whether the teenager would have actually executed the bombing plan remains unverified; he testified that he was only "50/50" committed to carrying out the attack.[The Guardian]

Sources