The price of the virtual currency bitcoin, which has increased by almost 20 times this year, fell 60 percent on Wednesday in a span of five hours, CNNMoney reported.

Prices hit a high of $266 earlier in the day before dropping as low as $105 in afternoon trading. It ended the day at about $145.

The rapid drop fueled speculation that bitcoin currency is a bubble that is going to burst. Click here for a crash course on bitcoin.