Minneapolis (CNN) — As a teenager, Robin Westman claimed to have been suspended after discussing school shootings with classmates – later writing in a journal that the incident was the origin of a deep obsession with mass shooters.

A decade later, Westman returned to Annunciation Catholic School and carried out those dark fantasies, killing two children at a Mass on Wednesday morning and injuring 18 other people.

As Minneapolis reels from the shooting, officials are combing through Westman’s rambling writings – which the shooter shared in YouTube videos timed to go online around the same time as the attack – to search for a motive.

A CNN review of dozens of those pages – most written in Cyrillic letters to mask the disturbing content – raises questions about whether people in Westman

See Full Page