Bitcoin’s rough week looks set to end on a sour note.

The virtual currency fell 4.2 percent to $8,936.50 at 6:53 a.m. in New York Friday, after earlier losing as much as 10 percent.

Bitcoin has slumped more than 20 percent this week amid increased regulatory scrutiny in the U.S. and Japan, an attempted theft at one of the biggest trading venues, and news that the bankruptcy trustee for Mt. Gox has started selling the now-defunct exchange’s holdings to repay creditors.

“The screen is flashing red today and people are getting fearful,” said Caleb Yap, co-founder of Singapore Bitcoin Club. “Weak hands are definitely wanting to sell. If Mt. Gox can dump $400 million of Bitcoin just like that and there’s still billions left, the fear is when is the big drop coming.”

Mt. Gox’s bankruptcy trustee, Nobuaki Kobayashi, disclosed on Wednesday in Tokyo that he sold about $400 million of Bitcoin and Bitcoin Cash since late September, part of the hoard left behind when the exchange collapsed four years ago. Kobayashi is studying further sales of the $1.8 billion remaining.

Signs of growing regulatory scrutiny have added to investor jitters. On Thursday, Japan’s Financial Services Agency ordered two exchanges to halt operations for a month and penalized four others. That announcement came just hours after a warning from the U.S. Securities and Exchange Commission that many online trading platforms should register with the agency.

Around the same time, Binance, one of the world’s biggest crypto exchanges, said it had been the target of a “large-scale phishing and stealing attempt.” While it said “all funds are safe,” Binance noted that it was unable to reverse some trades from accounts targeted by the hackers.

This article was provided by Bloomberg News.