Prices for bitcoin tumbled Thursday, moving well below $4,000 on heavy volume.

Bitcoin fell 9% to $3,686 over the previous 24 hours, according to Coinmarketcap.com.

Prices for other so-called cryptocurrencies fell as well.

On Sunday, Bitcoin worked its way above $4,000 for the first time since before Christmas.

A year ago, bitcoin was trading close to $15,000.

More from Technology

Tencent Content Is Not King in China

Tencent Content Is Not King in China

Qualcomm Falls After Short-Seller Argues It Will Lose FTC Case

Qualcomm Falls After Short-Seller Argues It Will Lose FTC Case

Blockchain, Cloud are Keys to IBM Cashing in on Consumer Trends

Blockchain, Cloud are Keys to IBM Cashing in on Consumer Trends

Micron Stock Still Too Early to Buy

Micron Stock Still Too Early to Buy

Resiliency Has Been the Biggest Trend for Xilinx Stock

Resiliency Has Been the Biggest Trend for Xilinx Stock