It's definetly a political murder though. I don't think Putin or the government made this happen though. If that would be the case, it would have been done with much more carefulness.
Besides, the russian nationalists and racists are getting more and more. It's something president Putin really needs to stop. It's getting way out of hand.
Anna could sometimes seem to defend terrorists and so on so forth, and I believe this has ticked of many nationalists in Russia.
Anna was supposed to publish some very "sensitive" materials to the newspaper today... So this could have been a reason for maybe the "security police" or the "national special forces", I don't know the english names. And President Putins birthday was yesterday, many think that this could've been a "gift" to him, which I kind of think is ridiculous.
The Suspect
http://img.aftonbladet.se/nyheter/0610/08/murd.jpg
http://img.aftonbladet.se/nyheter/0610/08/mord.jpg