I don't have any particular insight on the attacks on government buildings in Norway this morning, but just last week, Thomas Hegghammer and Dominic Tierney wrote a piece in the aftermath of a recently foiled terrorist plot that offered some speculation on how and why Norway became a target of Islamic extremists.
UPDATE: The suspect in custody is "Anders Behring Breivik, a 32-year old with right-wing extremist and anti-Muslim views."
