It's obviously speculation, but I don't think there is any fraud involving exchanges and inside trading. It can be a reflex of good news, as the management funds firm Fidelity is going to start trading bitcoin in some weeks (and this firm has good relations in Wall Street).
Knowing about this, many speculators started investing heavily in the market, as anyone could do the same, since the informations were public.
I believe the situation presented by the OP is only speculation. Bitcoin has gone upward trend because of more valid reasons. I guess.
More merchants are accepting btc as payment method. Big companies are starting to use blockchain technology in their operations. So honestly, I don't see any miracle or fraud from this bitcoin price increase.