It's a bunch of reasons.
The Mt.Gox coins selling. The statement by the SEC regarding ICOs and exchanges for more regulations. The genereal market sentiment seems to be more bearish as some expected to be. The Binance situation may just triggered the actual dump, but I'm pretty sure it would have happened nonetheless.
We probably need some more months of consolidation. Don't expect too much this year in terms of price. Sure if we go up make new highs, wonderful. But I wouldn't count on that. Absolutely not.