It is way too early to speculate about the two atrocities. According to RT, a jihadist group has taken credit and claimed the attack was for Norway's involvement in Afghanistan. One can only wonder why now as Norway has been engaged for some time, and why Norway when other countries have a much greater level of participation.
Anyway, here's some sanity from Zero Hedge:
http://www.zerohedge.com/article/oslo-jihadist-terrorist-blame-game-begins?utm_source=feedburner&utm_medium=feed&utm_campaign=Feed:+zerohedge/feed+%28zero+hedge+-+on+a+long+enough+timeline,+the+survival+rate+for+everyone+drops+to+zero%29
