Arda Küçükyetim

Arda Küçükyetim (born approximately 2006, Eskisehir, Turkey) attacked Tepebaşı Mosque in Eskisehir on August 12, 2024, stabbing five people, all mosque attendees, before his apprehension. All five victims survived. He livestreamed the attack through a vest-mounted camera on the platform Kick and had distributed his manifesto through a Telegram group he created prior to the attack. His manifesto cited Terrorgram Collective-associated "saints" (including Brenton Tarrant, Anders Breivik, Stephen Paddock, and Timothy McVeigh) using the "saint" terminology precisely. The Terrorgram connection was confirmed in the U.S. sentencing documents for Dallas Humber (December 2025) and in Matthew Althorpe's Canadian agreed statement of facts (March 27, 2026), both of which cited his attack as Terrorgram-inspired. Dallas Humber and Matthew Robert Allison were arrested by the FBI on September 5, 2024 - 24 days after the Eskisehir attack. Turkish courts sentenced Küçükyetim to 75 years and 5 months on September 24, 2025.¹

The Eskisehir Attack

On the evening of August 12, 2024, at approximately 18:22 local time, Küçükyetim approached Tepebaşı Mosque in Eskisehir, Turkey, dressed in an assault vest, a helmet, and glasses bearing the Black Sun symbol (a neo-Nazi emblem) and began stabbing worshippers. The five victims were Tevfik Arslan (73), Cumali Özemek (57), Naşit Özyürek (89), Metin Korkmaz (66), and Cemal Altıntaş (53). All survived their wounds.

He livestreamed the attack on Kick via a body-mounted camera. Prior to the attack, he had created a Telegram group where a contact distributed the manifesto, photographs, and supporting documents.

Manifesto and Ideology

Küçükyetim's manifesto explicitly invoked the Saints Culture framework, using the term "saint" to describe Tarrant, Breivik, McVeigh, and Paddock as inspirational figures. The document made an accelerationist argument: "This system will eventually collapse... My actions and yours will accelerate this collapse and sooner or later the country, and then the world, will be covered in anarchy." The manifesto file-sharing also included James Mason's Siege, Ted Kaczynski's manifesto, and Atomwaffen Division logos.

The file-hosting also contained the "Haters Handbook," an MKY propaganda document. Researchers, including in a GNET analysis titled "Dead Society" (August 2024), noted that Küçükyetim drew from multiple overlapping accelerationist networks, but the Terrorgram connection is the one confirmed through U.S. and Canadian criminal proceedings. He is not documented as a formal MKY member.

Natalie Rupnow, who carried out the Abundant Life Christian School shooting in Madison, Wisconsin in December 2024, had browsed Küçükyetim's Telegram chat before her attack.²

Terrorgram Attribution and International Proceedings

Küçükyetim posted a link to his livestream in a Terrorgram Collective group chat. In the Humber sentencing (December 19, 2025), DOJ prosecutors cited his attack among the attacks inspired or guided by Terrorgram's operational network under Humber's leadership. In Althorpe's agreed statement of facts, Canadian prosecutors confirmed that his publications had inspired "the stabbing of five people at a mosque in Turkey in 2024."

The FBI arrests of Humber and Allison came on September 5, 2024, 24 days after the Eskisehir attack, as part of the same coordinated operation that had been building since Althorpe's December 2023 Canadian arrest. The Daily Sabah (Turkey) reported at the time of the U.S. arrests that the FBI was specifically connecting them to the Küçükyetim case.¹

Turkish Sentencing

On September 24, 2025, Küçükyetim was sentenced to 75 years and 5 months in Turkish prison, comprising four 15-year sentences for attempted murder, one 11-year-and-8-month sentence, and 3 years and 9 months for creating public panic.³