Judge Mr Justice Wall sentenced Jagger Strang to almost four years for threating to bomb Stafford College and to kill students
Explosives were found at the 18-year-old's home alongside a blowpipe
However, the sentencing hearing at Birmingham Crown Court heard he pleaded guilty on the basis he had no intention to build a bomb
In submissions, the prosecution said Strang had a "troubling extremist mindset" and idolised serial killers
The defence said Strang's intention was to impress other students
Jagger Strang was sentenced for committing seven offences.
These were:
Following Stang's pleas eaerlier this year, Det Insp Dave Rowlands thanked students and staff at the college for their vigilance.
He said the situation had "understandably caused significant alarm to the students that Strang talked to and staff at the college".
Rowlands said the "swift action" of police officers meant they were able to intervene quickly and prevent any potential harm.
“We take all reports of this nature extremely seriously," he added.
"The outcome of this case demonstrates our commitment to working closely with partner agencies to identify risks early and to take robust action to protect the public.”
Image source, Staffordshire PoliceAs well as explosive substances, police discovered a homemade blow pipe at Strang's home, which accounted for the possession of a prohibited weapon in a private place charge that Strang admitted in May.
However, in mitigation, the defence said that this was for "recreational use".
Strang is handed almost four years in a young offenders' institution.
Wall said there was a "longer-term potential" for harm, given Strang's obsession with serial killers and explosives.
He told the court the gunpowder and thermite were "not toys" and were "akin to dangerous weapons".
Wall said one of the group Strang confided in was concerned about what he was saying.
He mentions the videos of him setting off explosives in his garden and sending messages about serial killers.
This led to concerns being raised to the college, Wall added, and the site being evacuated.
Judge Wall says Strang accessed two documents - one on how to make an explosive device and one on how to make gunpowder.
His offending came to the attention of the authorities after he told classmates about blowing up the college with a pressure cooker - including details of which classroom he would destroy and how he would escape.
Wall said Strang carried out internet research in September, including documents "of use to terrorists".
He said there were no plans for him to make the videos more available but it remained illegal for him to access them.
"You wanted to be like the serial killers," the judge tells Strang.
"At the same time, you developed an unhealthy interest in explosives. You acquired the chemicals necessary to make gunpowder and thermite, and you made them."
Mr Justice Wall has returned to the court and he has started to give his sentencing remarks.
He outlines the offences he will be sentenced for, saying that he pleaded guilty on the first day of his trial, and will receive 10% credit.
Wall said Strand is now 18 years old and the offences were committed when he was aged 17.
He said he accepted Strang was an "isolated young man" and he never came to terms with the family's move to the UK from South Africa, about three years ago.
The judge, Mr Justice Wall, is set to return, when he will sentence Strang.
Viewers will be able to watch his remarks live via the Watch Live button at the top of this page.
The defence has concluded its statement and the judge has risen for a short break, with court set to resume at 15:50 BST.
Access to videos on weapons is "everywhere" online and "all around us, all the time," the defence says.
The blowpipe was "homemade" and for "recreational use", the defence says.
Discussing the explosives, young boys "do experiment" and "do dangerous things" the defence adds.
Miskin reiterated that the chemicals were bought by Strang's mother.
The explosives were not used aggressively, the defence adds. Some of them, at least, were not viable.
The court is told that none of the risks had been realised and "nobody was hurt by" his experiments.
He said many young people do dangerous things, including creating explosives.
"Jagger Strang did not make a bomb, nor did he intend to - he made some gunpowder," Miskin said.
Strang had a total of about 120g of gunpowder which equates to approximately 8-10 tablespoons, the defence said.
It was described as "not very much" and "homemade" by the defence.
"We all just laughed it off", one of his classmates said of his claims about making a bomb, the court was told.
Another said it made them feel uncomfortable but not fearful.
The curriculum lead at the college took it more seriously, however, and informed the college’s safeguarding team.
Staff concerns led to the college being evacuated.
The defence says Strang did not say he had planted a bomb, and his intention was to impress other students with his ability.
Miskin said Strang was 17 years old at the time of the offences, adding that young people often found it difficult to manage their emotional state.
He had previously admitted that he struggled to express his distress, the court was told, and this would lead to behaviour that was impulsive.
Miskin went on to say that his interest in serial killers did not come out of the blue but was a "reaction to real-life events" and that he had no coping mechanism and a personality that was "obsessive".
Strang was "a young man of good character" the defence says. He is not "radicalised" or a visitor to the "dark web".
He willingly handed over his phone to police and supplied the pin number.
He "is not evil" the defence adds, and according to his mother had always tried to lead a productive life.
