^
Yep, I'm sure this is all Bush's fault but, according to The Guardian, NRK is reporting that an unknown group called “Helpers of the Global Jihad” have posted a message that this is only the beginning of the reaction to Norwegian periodicals publishing the Muhammed cartoons, according to Andrew Boyle, a journalist in Norway.
The NY Times has more on the terror group:
A terror group, Ansar al-Jihad al-Alami (the Helpers of the Global Jihad), issued a statement claiming responsibility for the attack, according to Will McCants, a terrorism analyst at CNA, a research institute that studies terrorism. The message said the attack was a response to Norwegian forces’ presence in Afghanistan and to unspecified insults to the Prophet Muhammad. “We have warned since the Stockholm raid of more operations,” the group said, apparently referred to a bombing in Sweden in December 2010, according to Mr McCants’ translation. “What you see is only the beginning, and there is more to come.” The claim could not be confirmed.