So yesterday a hacker is stolen 120k BTC exactly is 119,756 BTC, and they confirmed it the BTC is stolen from bitfinex that's why the current price of bitcoins is down fall -20% as you can see the price right now, probably the hacker was sold it and make the price down like this. I think the hacker wasn't sold all btc (120k) and when ever they will sell it the price of bitcoin for sure will go down again.
It's really dangerous to save bitcoins on a exchanger like MtGox,Bitfinex. We need a trusted exchanger and also no one can hack it.