Sydney teenager tells court how he radicalized online and planned an attack

The teenager, identified in court by the pseudonym RK, pleaded guilty to preparing or planning a terrorist act. Justice Stephen Campbell noted that he had no specific attack plan and had not acquired materials to make a bomb.

How the content changed

RK said he first watched historical videos on TikTok with political themes, about the Crusaders and their empires. He then moved on to videos about the events of September 11, 2001, the ensuing war on terror, and other wars. Later, he began watching religious videos that led him to content featuring increasing levels of violence, and then discussing these topics with people online.

RK said he wanted to impress them. Soon, the Sydney Opera House caught his attention as a possible target. He described himself as radicalized and “brainwashed by propaganda” when he began watching bomb-making videos on YouTube. Campbell’s assessment, however, was that the teenager had no specific plans.

On Telegram, RK searched for instructions on making a pressure-cooker bomb. He also tried to contact Dzhokhar Tsarnaev by email. Tsarnaev survived the attack at the Boston Marathon.

How he used ChatGPT

The teenager asked ChatGPT about Tsarnaev and whether prisoners had access to news. He then wrote to the prison’s publicly available email address to ask whether he could send Tsarnaev a letter. RK never managed to reach Tsarnaev and did not send him a letter, Campbell said.

RK also asked ChatGPT about security at the Sydney Opera House, where the Sydney Marathon finishes, and about places where terrorists are imprisoned in New South Wales. He watched videos of the Opera House on YouTube and researched gay clubs and other places where, as he put it, “infidels” gather.

On Telegram, the teenager shared Islamic State videos with others to win their approval: Campbell noted that RK thought it was “cool.” OpenAI, Telegram, and YouTube were asked to comment. TikTok declined to comment.

Court considers the teenager’s remorse

RK later expressed remorse. According to the judge, he completed six sessions on religious and ethical issues with a Muslim cleric. Campbell found that the teenager had genuinely renounced his commitment to Islamic violent extremism. The judge added that the radicalization had been limited and uncertain, and that the deradicalization process had already made substantial progress.

Last month, Claire McGuinness, deputy director-general of the Australian Security Intelligence Organisation’s (ASIO) intelligence support service, spoke about the difficulty of detecting radicalization among teenagers online. She was appearing before a parliamentary inquiry.

McGuinness said the process often begins unobtrusively: a teenager scrolls through Instagram, TikTok, or a similar platform and comes across, for example, a political meme or a religiously conservative video. At first, the content may simply be fringe and close to extremist. But after the teenager engages with it, the algorithm changes their feed: the material becomes more radical and starts to pose a security concern.

Teenagers then often move to Discord or Telegram. There, McGuinness said, “dark humor and provocative memes” gradually acclimatize them to increasingly extremist content. Passive viewing can turn into an active search for ways to commit violence.

Dataist’s take: This case shows how online radicalization can connect social media recommendations, closed platforms, and the search for practical information, including with the help of a chatbot. At the same time, the court said RK had no specific plan or materials to make a bomb, and that he had renounced his extremist views.