A Blackwood man has pleaded guilty to charges of making explosive devices at his home.
Darren Tinklin, 24, of Waunllwyn Crescent, admitted two charges of making explosives, including black powder and a pipe bomb, and possessing a firearm, at Cardiff Crown Court.
He made the admissions via a video link from a high security cell at Long Lartin prison in in Worcestershire and the court was told that Tinklin was a former member of a far-right group.
The court was also told that Tinklin had not meant to harm anyone and was experimenting.
Gwent Police originally arrested Tinklin and two others on suspicion of drugs offences on October 21 last year after executing a warrant under the Misuse of Drugs Act.
After further inquiries, the Metropolitan Police Service Counter Terrorism Command was called and the trio were transferred to a central London police station for questioning.
They were re-arrested on suspicion of the commission, preparation or instigation of acts of terrorism under the Terrorism Act 2000.
The two other men, aged 24 and 41, were later released without charge.
A charge of possessing a document containing information “of a kind likely to be useful to a person committing or preparing an act of terrorism” was dropped.
Three other charges of making explosives were ordered to lie on file and Tinklin made no application for bail.
He will reappear for sentencing next month.