Without reading the story, or the thread, let me guess. This was a group of Icelandic youth on a rampage?
Sarc/off
With all due respect, I'm going to disagree with you and others who mentioned groups like the Amish and Quakers.
Though the stories never mention race, the anecdotal evidence overwhelmingly points Swedish kids. I've been following these "wilding" stories, so I know what I'm talking about.