No way this was done by Islamists. A bomb near the PM's office, followed by an attack on a remote island where a Labor party youth rally was taking place! Had it been Islamists, the bomb would have been in the city center and gunman would have attacked in city where most death would result.
This was done by Norwegian right wing terrorist.
Norway like so many other countries is so focused on the Islamist threat they have overlooked the now very real internal right wing nutter threat.