Bitcoin and other Cryptocurrencies are Crashing

On this Monday, Bitcoin has fallen down 13% to less than 7500$, it has reached the lowest price since November 2017.
The other major cryptocurrencies are not better.
Cryptocurrencies such as Ripple or Stellar fallen down by more than 40% past week.
If this would happen in the stock market, you could it call a crash.
A possible reason of this crash could be the negative cryptocurrency headlines in 2018 seem to have frightened investors.