We have seen countless time that bitcoin and altcoin market bleeds. So I just this what you are seeing today is not a exception. I believed that there is a manipulation, not just today but in the past and it will still occur in the future. I see most of the top altcoins have already lost more than 20%, while bitcoin around 15%. So that's serious manipulations.

But not all of them though are thru manipulations, maybe half of it are cause by the panic investors as well. Someone made large sell orders, others saw it the wall, then they follow suit and then the fear of others making them sell as well. But again, bitcoin have shown that it can recover, think of what's happening right now in a bright side. Buy more bitcoin and altcoins because they are down right now.