Bitcoin slumped to its lowest level since Christmas day as South Korea’s justice minister reiterated his proposal to ban local cryptocurrency exchanges, fueling concern a state crackdown will erode demand for digital coins in one of the world’s biggest markets.

The minister’s comments to reporters on Thursday were later downplayed by a spokesman for President Moon Jae-in, who said the proposal is one among several and that nothing has been finalized. Korea’s government unveiled multiple options for cryptocurrency exchange regulation on Dec. 28, including allowing trading to continue under tighter supervision.

Governments around the world are increasing scrutiny of cryptocurrencies as soaring prices attract everyone from mom-and-pop investors to Wall Street banks. Korea emerged as something of a ground zero for the speculative mania, playing host to several of the world’s most active exchanges. Bitcoin prices in the country are persistently higher than those in the U.S.

The boom has alarmed Korean authorities. The country’s prime minister has said that cryptocurrencies might corrupt the nation’s youth, while the government warned in December that it would be conducting on-site investigations of exchanges. The finance ministry is studying a cryptocurrency tax.

“For the last few months the Korean government has been making it very clear they want to bring this speculative activity under control,” said Thomas Glucksmann, Hong Kong-based head of APAC business development with cryptocurrency exchange Gatecoin Ltd. “This isn’t really too much of a surprise.”

Bitcoin dropped as much as 12 percent to $12,801, before paring the loss to about 5 percent at 9:10 a.m. New York time, according to data compiled by Bloomberg. Ripple trimmed its 21 percent tumble to a 14 percent drop, while ethereum slumped 5 percent.

One of Korea’s biggest digital currency venues, Bithumb, said on Thursday that it met briefly with tax officials this week. The exchange disputed a Reuters report that its offices had been raided by tax and police agents. When contacted by Bloomberg, Korea’s tax authority said it doesn’t comment on investigations due to privacy laws.

Coinone, another exchange mentioned in the Reuters report, didn’t reply to requests for comment. An unidentified spokesman told the Financial Times: “They asked for some data such as cryptocurrency trading volume, our exchange’s sales and whether we are paying corporate tax well.”

Police have been investigating Coinone’s margin-trading service since last year, according to an official who asked not to be named citing policy. He added that no other large exchanges are under police investigation.

A range of negative comments from investors and governments have undercut the market this week. Ripple, for example, is down for a fourth successive day, something it hasn’t done since October. The market was “reeling” on Thursday over comments by Warren Buffett, eToro Senior Market Analyst Mati Greenspan said in a note today. The legendary investor said crypto gains will be fleeting.

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