A teenager has been jailed at the Old Bailey for eight years for grooming a young man with learning difficulties to carry out a copycat killing of Lee Rigby's murder in Woolwich.
Kazi Islam tried to persuade 19-year-old Harry Thomas to buy the ingredients for a pipe bomb and to attack one or more soldiers with a kitchen knife or meat cleaver on his command.
The 19-year-old encouraged Thomas to start calling himself Haroon instead of Harry and attempted to radicalise him with stories of innocent children murdered by military forces.
But Islam's schemes were foiled when Thomas failed to buy any of the right ingredients for a bomb and let slip to "a few friends" what they were up to.
The defendant, who will serve his sentence in a young offenders institute, denied wrongdoing, saying that he only talked to Thomas about getting the components for a bomb as an "experiment" in radicalisation.
Sentencing, judge Richard Marks QC told him that his behaviour towards Thomas, who suffered from Aspergers syndrome and ADHD, was an aggravating feature.
He said: "Even on your own account, that you knew he was an extremely vulnerable young man, your treatment of him was as callous as it was manipulative."
Judge Marks said that since his conviction Islam had shown neither remorse nor insight into the seriousness of what he had done.
He ordered Islam to be subject to a terrorism prevention requirement for 15 years.