Sydney teen pleads guilty over Opera House and marathon bombing plot

A 16-year-old boy in Sydney has pleaded guilty to planning a terrorist act after the court heard he had researched a bombing targeting the Sydney Opera House and the Sydney Marathon. The sentencing hearing in the New South Wales Supreme Court heard that he was radicalised online and later communicated with extremists on Telegram. The teenager cannot be identified because of his age.

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The court was told the boy first encountered extremist material on TikTok in 2024, when he was 14, before being drawn into increasingly violent content. He said he became interested in historical conquests, then saw material linked to the aftermath of the 11 September attacks and propaganda from Islamic State. He told the court he began talking to people on an encrypted messaging app about learning how to commit terrorism.

According to the hearing, the teenager then started looking at how to target the Sydney Opera House on one of the busiest days of the year, when the marathon finishes at the landmark. He said he viewed the race as a way to maximise the number of people and tourists present. The court also heard that he referred to the 2013 Boston Marathon bombing as a model, and that he had written that he wanted to test and carry out the operation.

The case is significant because it involves one of Australia's best-known landmarks and a major public sporting event. The Sydney Opera House is a globally recognised site, while the marathon attracts large crowds and international attention. The hearing also underlines continuing concern among Australian authorities about the way extremist material can reach teenagers through social media and encrypted platforms.

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The boy told the court that his justification for the planned attack was linked to anger over Australia's role in wars in Iraq and Afghanistan and the killing of Muslims. He also said he had been trying to impress others online and had found the extremist conversations interesting. The court heard that the planning took place over more than a month in 2024, but the current hearing focused on his guilty plea and the evidence to be considered before sentencing.

What remains unclear is the sentence he will receive and how the court will weigh his age, the extent of his preparation and his later claim that he has been de-radicalised. It is also not clear whether any wider investigation is continuing into the online contacts he described. Sentencing is expected to be the next major step in the case.

A teenage boy in Sydney has pleaded guilty to preparing a mass terror attack inspired by Islamic State, in a case heard in the Supreme Court. The court was told the then 14-year-old had been considering an attack in the city's central business district after being radicalised online. He remains on bail and is due to be sentenced next month.

The hearing heard that federal police arrested him in August 2024 at his home in western Sydney. Officers found more than 40 videos on his computer containing extremist material, according to the court. The boy, who cannot be identified because of his age, admitted committing acts in preparation for a terror attack.

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The court also heard he had been researching target locations and attack methods, including the use of explosive devices. Among the places discussed in court were the Sydney Opera House and the Sydney Marathon. The boy was also said to have shown interest in emulating the 2013 Boston Marathon bombing.

However, the court heard he had not taken steps to obtain materials needed to make a bomb or carry out an attack. He told the court he had been "thinking about it" and was "50/50" before his arrest. The case highlights the continuing concern among Australian authorities about online radicalisation among young people.

The court heard the boy first encountered extremist material on TikTok earlier in 2024 and later consumed increasingly violent content on other sites. He also told Youth Justice workers that he had been raised by "good parents" who taught him to respect everyone, underlining the gap between his family background and the material he was drawn to online. The boy told the court he had shared extremist content with others and was trying to impress them.

He also said he had since been de-radicalised and now believed Islamic State was "absolutely horrifying". In court, he said he was no longer an Islamic extremist and expressed remorse for his actions. The proceedings suggest the case is now moving toward sentencing rather than a contested trial.

What remains unclear is the sentence he will receive and how the court will weigh his age, the extent of his preparation, and his claimed de-radicalisation. The case also leaves open broader questions about how extremist content reaches teenagers on social media and how early intervention can prevent online radicalisation from progressing into concrete planning. Sentencing next month is likely to provide the next significant development.

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