A 21-year-old man living Bradford has been jailed for two years after admitting possession of terrorist documents, including instructions for making firearms, explosives and poisons.
Ondrej Sidelka, of Elwyn Road, pleaded guilty to eight counts of possessing information likely to be useful to a person committing or preparing an act of terrorism, under Section 58 of the Terrorism Act 2000. He was sentenced on 1 August 2025 at Leeds Crown Court. A further charge under the Terrorism Act 2006 was discontinued.
According to Counter Terrorism Policing North East, the offences came to light after Sidelka was arrested in November 2022 for an unrelated incident. A search of his phone uncovered extensive racist, antisemitic and neo-Nazi material in his Google Drive and Dropbox accounts, along with manuals on how to manufacture weapons and conduct attacks.
Sidelka’s material included propaganda from proscribed extreme right-wing terrorist groups such as Atomwaffen Division, Feuerkrieg Division and Terrorgram. He also possessed a graphic video of the 2019 Christchurch mosque shooting in New Zealand.
Detective Chief Superintendent James Dunkerley, Head of Counter Terrorism Policing North East, said: “The shocking and disturbing racist material Sidelka downloaded, as well as his interest in extreme violence and manufacturing homemade firearms, show the threat he posed to the community.”
He added: “The efforts he made to disguise his true identity online, and to post opinions on social media which were not as extreme as those he held in private, indicate that he knew how unacceptable his views really were.”
Sidelka, who was 18 at the time of the offences, will also serve a further year on licence and is subject to a 10-year Terrorism Notification Order following his release.
“Young people are particularly vulnerable when it comes to being influenced by hateful and harmful ideologies online,” said DCS Dunkerley. “I would urge people to ACT Early and help us to stop young people being drawn into extremism.”
