Is this the first such attack in Scandinavia?
Just want to point something out here. Chechen rebels/separatists are good at this type of terrorism. 'Caucasian Emirate'. They did many such attacks, mostly within Northern Caucasus. Consequently, Scandinavian countries took in large number of Chechen 'refugees' (many of whom were boeviki, rebel fighters, and even a few commanders). I don't know, but it is an interesting coincedence. This is the the Emirate's style, absolutely. 2 years ago, the rebels attacked a police station in Ingushetia this way, for example.