https://www.reuters.com/article/us-markets-bitcoin/bitcoin-slides-18-percent-on-crackdown-fears-crypto-rivals-also-plunge-idUSKBN1F50UL

Bitcoin tumbled 18 percent on Tuesday to a four-week trough close to $11,000, after reports that a ban on trading of cryptocurrencies in South Korea was still an option drove fears grew of a wider regulatory crackdown.