Nicholas Prosper admitted to using a shotgun to kill Juliana Falcon, 48, Kyle Prosper, 16, and Giselle Prosper, 13, at their home in Luton in September. The 19-year-old had planned to kill about 30 students and staff at his former primary school,

Nicholas Prosper used an illegally-owned shotgun to kill his mother, his sister and his brother and also planned to carry out "the biggest massacre in the 21st century" in Luton in September last year

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