I was just reading the story. This guy attacked someone and then a girl (and friends) took a photo of him with his sword all bloody (that photo posted above), thinking it was a Hallowe'en costume. A teacher came out and told him to stop scaring the kids, so he stabbed her and then the girls ran off. WTF was going on in Sweden that day?
I guess rules are pretty lax there because knife crime is high profile here, there's no way you could walk into a school with a sword.