Finland has up to a few dozen people living in the country with connections to international terrorist organisations. As SUPO sees it, some of them might be capable of perpetrating terrorist acts themselves.
and some other stuff there
Yes. It's very frightening.
Finland looks to me as one of the last reasonble places for a terror attack
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.