The reason of price decline is still unclear but it was hinted that in Germany some major people are against this Currency and actually wanted to ban it.
If you are looking for some informational reason of the price decrease then you shouldn't think about this conspiracy stuff. If that news were strong enough to change the BTC price then you would probably see it on every website.
That seems to be just a correction. We had a good and very fast growth with only several short stopages without any serious changes. So a correction was just a matter of time. But the faster it happens the less painful it will be.