Bitcoin is tumbling

It's a rough start to the week for bitcoin. The cryptocurrency trades down 10.11% on Monday, at $2,275 a coin, a one-week low.
The action seems to be a continuation of the selling that developed on Wednesday, when rival Ethereum flash-crashed from $296 to 10 cents before recovering its losses.
Bitcoin is down about 16.6% since Wednesday's opening print.
The recent weakness in bitcoin follows a run-up of more than 200% to start the year. Bitcoin's 2017 gains have been propelled by heavy buying fr