A teenager accused of planning a repeat of the Columbine high school massacre at his former school in Loughborough is facing a retrial.
An Old Bailey jury of six men and six women argued for six days before their deliberations over the case ended in deadlock.
It is claimed the youth planned to arm himself with guns, bombs and knives in a deadly assault.
He built pipe bombs, smoke grenades and improvised explosives in his bedroom and tested Molotov cocktails behind the local leisure centre, the court heard.
The boy, from Loughborough, denied he was plotting a massacre and his lawyers claimed he was "retreating into fantasy".
The teenager, who cannot be named, will now face a retrial in the New Year.
The youth admitted possessing a knife, and confessed to possessing parts for an improvised explosive device halfway through the trial.
The teenager denies possessing an article for a purpose connected with terrorism, and possessing a document likely to be useful to a person committing or preparing an act of terrorism.
He has pleaded guilty to possessing an offensive weapon and possessing an article for a purpose connected with terrorism.
Two other 17-year-old boys from Loughborough admitted possessing petrol bombs and pipe bomb parts before the trial began. They face sentence on December 12.
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