[Thor]

7.11pm: The New York Times has more on the claim of responsibility by an Islamist group (thanks to Marta Hernandez Salvan for passing this on):
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.

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