BTC-e exchange alone has low prices usually for a reason, yet alone price manipulation.
It usually occurs based on people with the ties of the exchange itself.
I remember reading article on coindesk 2 years back based on btc-e on how the russian exchange operated.
Yeah, well... Insider trading sounds like a very possible/likely explanation, could very well be people trying to get out at every cost, because they know that some sort of hammer is going to come down. What did the report you are hinting at exactly say?