A teenager with a previous conviction for making a pipe bomb found in his Nazi memorabilia-filled bedroom has been detained in a young offenders institution for a terror offence.
Jack Coulson was convicted by a jury of constructing the device last year, and was given a youth rehabilitation order.
In a separate prosecution, the 19-year-old admitted possessing a document or record for terror purposes, namely The Big Book Of Mischief.
Prosecutors allege he downloaded the manual shortly after boasting to people in an approved hostel about wanting to kill a female MP.
Leeds Crown Court heard how the manual, downloaded to the defendant's phone, seeks to "demonstrate the techniques and methods used in a number of countries to make hazardous devices".
Further searches of his phone uncovered references to proscribed right-wing group National Action, as well as audio recordings of people screaming in the aftermath of gunshots and internet searches for Timothy McVeigh, the 1995 Oklahoma City bomber.
Sentencing Coulson to four years and eight months in a young offenders institution, Judge Marson QC told the teenager on Thursday: "Time and time again you were a given a chance in relation to the previous offence.
"Help was repeatedly given, but you continued to breach the order that was given to you."
David Temkin, prosecuting, claimed the teenager continues to hold "an active interest in far-right political views and violence", and had a note in his house which read: "They are not going to cure me of my views."
Mr Temkin added that, during a police interview, Coulson had described Adolf Hitler as his "leader".
The jury heard how Coulson's bedroom was filled with Nazi symbols, including flags bearing the swastika and the symbol of the Waffen SS.
However, the teenager told the court he never intended to use the pipe bomb. He was convicted of constructing the explosive device but cleared of a terrorism offence.
Prosecutors said that, while attending preventative intervention programmes, Coulson dressed in camouflage and claimed "all Jews should be exterminated".