[plain talk]

The bomb squad and a dog unit are at the scene, but it is currently unclear what caused the blast.

... muslims

[Celerity]

“... muslims”

It can be anything, really... Here, lets look at this list of potential Swedish threats and Swedish people:

Architects.
high-end durable goods designers
doctors
nuclear physicists
high-end fashion designers
muslims.

Come on ! It could be ANYONE ! (Do I need a /sarc?)