...INSPIRED BY OTHER MASS CHILD KILLINGS

SONBOLY was obsessed by mass killings of young people, according to police. He carried out his spree on the fifth anniversary of a massacre in Norway by Anders Breivik, left, which left 69 dead, and the 18-yearold killer may have used a photo of Breivik as his profile picture on messaging service WhatsApp. A book c called Why Kids Kill: Inside The Minds Of School Shooters, inset, was found inside the backpack Sonboly was wearing during Friday’s attack.