Dude released a 800 000 words book available online where he exposes his political thoughts, motivations, and instructions on how to do same.
I've seen that "manifesto", browsed through it, it's terrifyingly scary reading, especially at the end. He details everything, from getting materials for explosives, manufacturing them, obtaining weapons, even businesses he got them from, websites and sports/gun stores in Oslo. Hopefully a lot of people will get a serious visit from the police pretty soon. How the hell this nut managed to get an automatic rifle with scope, a Glock, several tons of fertilizer, equipment etc, and not get red flagged by the security services is a mystery.
Autenticity is not verified as yet though, but it would be one hell of a fake job. He posed with the anglified name "Andrew Berwick".
Also of note is photos of him in some kind of diver (skins?) suit, aiming a scoped assault rifle, and with a logo on his left shoulder stating "Marxist Hunter Norway"... There's also a 12 min hate-video on YT where the same logo is shown with England instead of Norway. There might even be "cells" in England, but it might also be very far-fetched at the moment.
I'm not posting links but it will be all over the place pretty soon anyway.