The police were on the spot disarming the man within 50 minutes of being alerted. Considering they were dealing with a massive crisis in Central Oslo, and the camp was way out in the country, that compares pretty well to how the British police responded to say, the Cumbria shooting spree.

Sometimes when people talk about how "it's easy with hindsight" what they really are trying to excuse is a lack of foresight. Not in this case, I feel. Nobody could have anticipated it.