Breivik prime suspect profile
Anders Behring Breivik's Facebook page was blocked soon after news of the attack emerged, but a cached version describes a conservative Christian from Oslo who owned his own organic farming company, called Breivik Geofarm.
The profile veers between references to lofty political philosophers and gory popular films, television shows and video games.
The account appears to have been set up on July 17. The site lists no "friends" or social connections.
The profile lists interests including hunting, political and stock analysis, with tastes in music ranging from classical to trance.
Breivik had also set up a Twitter account recently, with a single post on July 17, a citation from 19th Century thinker John Stuart Mill: "One person with a belief is equal to the force of 100,000 who have only interests."
Yesterday, about 10 policemen were outside Breivik's registered address in a four-storey, red-brick building in west Oslo.
The Norwegian daily Verdens Gang quoted a friend of Breivik's as saying he became a right-wing extremist in his late 20s. It said he expressed strong nationalistic views and had been a strong opponent of multi-culturalism.