Nicholas Prosper, 19, planned to kill 30 pupils and two teachers after shooting his mother, brother and sister dead

A 19-year-old man who shot dead his mother and two younger siblings had planned to kill 30 children at a primary school before being stopped by police, a court has heard.

Nicholas Prosper, from Luton, Bedfordshire, had wanted to carry out the killing at his former primary school to gain notoriety as a mass murderer, and had been planning it for months.