There are a lot of factors influencing the price of bitcoin, including technical issues/new alts coming out/regulations/stubborn miners/conflicts between developers(or groups)...etc.
What do you think is the most crucial cause? Why did the price drop dramatically these days? Will this be a rebound point?
The reason why the bitcoin price are changing it's a supply and demand, we knows that the value of bitcoin are very volatile and it is hard to know if it's continuing to increase because sometimes it will dropping her price. And yes the negative news will may affect the bitcoin price but it will recovery.