He is described in media as conservative right wing extremist. Was running an agriculture company which gave him access to huge amounts of synthetic fertilizer, same stuff the bomb in Oklahoma was based on.
"Anders Behring Breivik (born 13 February 1979) is the suspect being held for perpetrating the gun attack.[28][29][30] He has also been linked with the bomb blast that took place approximately two hours earlier, and is now in police custody.
Behring studied at the Oslo Commerce School, and is described by newspaper Verdens Gang as Conservative and nationalist.[30] He is a self-declared admirer of Winston Churchill and Max Manus.[31]As well as other works by John Stuart Mill, John Locke, Immanuel Kant and Plato.[32] He owns the company Breivik Geofarm.[33]"
http://en.wikipedia.org/wiki/Anders_Behring_Breivik#Perpetrator