Finnish gunman left a warning video on YouTube before carrying out the shooting

In fact, according to messages, the killer had uploaded a warning video to YouTube several weeks ago, with the title "Jokela High School Massacre - 11/7/2007" and his registered name was "Sturmgeist89". YouTube has deleted all 89 videos on the account. The real name of "Sturmgeist89" is Auvinen and the reason for his extreme behavior was probably that he was often bullied at school.