This is a post that came from bloomberg. The news seems credible since it came from a well known site.

The reason why bitcoin price fell is Japan's Financial Services Agency was said to be planning to tell Binance to stop operating without a license.
Bitcoin's price felll 4.4 percent to $8,500 because of this news.

Binance told Bloomberg News in January that it was working to acquire a license in Japan so there is nothing really to worry about.
Binance will surely comply with that since it will also help their exchange be more reputable and legal.

Link to the post:
https://www.bloomberg.com/news/articles/2018-03-22/bitcoin-falls-after-report-that-binance-faces-warning-in-japan