I suggest to leave it there for now as it is just speculation, they don't know. They have been mentioning a lot the Norway guy but targets were different, he targeted a political party and had prepared explanations for his actions and political motivation, yet nothing here and the victims in the first shooting may have been picked for being traitors after serving in Afghanistan. So....
It is attractive for political motives to head to right extremism but very dangerous next targets can be any gov institutions, a school with lots of kids, any church office time or shopping center would prove gov totally powerless and look stupid.
The Washington sniper John Allen Muhammed in the US managed to go on for three weeks but his targets were random so it probably doesn't fit anymore than Breivik does.