To add to the mix:
Alleged Oslo Terrorists Claim Responsibility Via Jihadi Forums, YouTube
fast and company ^
Posted on Friday, July 22, 2011 9:28:03 PM by RC one
A terrorists group has claimed responsibility for today’s attacks in Oslo, Norway—which included the bombing of the Prime Minister’s office and a massacre at a children’s day camp by a gunman dressed as a police officer—using social media.
An obscure group called Ansar al-Jihad al-Alami (Assistants of the Global Jihad) posted a message on an Islamist bulletin board called Smukh and may have uploaded a video to YouTube several days ago predicting the attack, in which at least seven people were killed.
http://www.freerepublic.com/focus/f-bloggers/2752673/posts
That's the smoking gun right there.