"My understanding is that Norway believes he acted alone."
Do you have an impeccible source for that?
The British police think both his and Ray's statements are serious enough to be acted on - he claims links with the English Defence League and with The Knights Templars, his actions were aimed at "waking up Europe"; god knows there are enough nutty racists around for some to possibly have heeded that call (we even have evidence of appeasers on this thread).
"I would not, as you have done include any other group or individual with him until concrete evidence is provided that others are involved."
What evidence do you want, another massacre? Surely you act on the side of caution where behaviour such as this is concerned?
I suggest you re-read Tommy Robinson's statement "the slaughter might wake Europeans up" fairly close to Breitvik's own.
As I said, early days; too early to take chances.
Jim Carroll