I have a very good friend who lives in Norway. They are terribly shaken; Norway only has 5 million people, and they all “know each other,” in a way.
She can give me more info on what they report there. Right now, it seems as if this fellow was the lone shooter; he left incriminating detail on his Facebook page (now pulled) and sent twitter messages indicating his frame of mind. She, and other Norwegians, seem to have no doubt that he was the murderer.
That fb page was an obvious fake.