Two inmates already serving life for murder have been sentenced to six more years each for threatening to kill a prison officer days after the murder of Fusilier Lee Rigby.
Feroz Khan and Fuad Awale, both 26, were found guilty at the Old Bailey last week following the incident at HMP Full Sutton in North Yorkshire on May 26 last year.
Khan was also convicted of inflicting grievous bodily harm on prison officer Richard Thompson after relations between Muslim inmates and guards ''became strained'' in the days following Fusilier Rigby's death.
Judge Michael Topolski QC today sentenced Khan,originally of Lidget Green, Bradford, to six years for threats to kill and three years for GBH, to run concurrently at the end of his life sentence with a minimum of 20 years.
Awale was also sentenced to six years for threats to kill, to be served at the end of his life sentence, which carries a minimum term of 38 years.
Passing sentence, the judge said: "This was a premeditated, well planned and carefully orchestrated attack on a single and previously identified prison officer, who was, as such, performing a public duty and upon whom it has had a significant impact.
"The events as a whole formed part of a joint enterprise involving force and weapons, committed by men with convictions for murder."