Wasn't there a bomb in a Helsinki shopping mall a few years ago? Of course that had nothing to do with Islamic fundamentalists, but it goes to show that even a place like Finland isn't immune from this kind of atrocity.
Yes there was. It was a Finnish lunatic without any connections to "real" terrorists and political motives. He had got his knowledge about explosives from Internet. 6 people was killed including suicide bomber.
It's frightening that people can just find out how to build a bomb on the internet. We had our own lunatic like that in London, a right-wing extremist who bombed a gay pub and two areas with a high proportion of ethnic minorities. There are some scary people in this world...