Do you think that a police could really uncover this? Isn't this a kind of international plot from terrorists against Sweden? Well, if this is just a local attack, there's no much to worry. I mean there's is to worry, but not that much like once an international terrorist attack, other countries should also be prepared from uncertain imminent attacks. Because you really can't say, you only can predict, but prediction is never certain.
I don't think it's a group specifically targetting Sweden, i think it's just a group of maniacs that happen to be in Sweden.