Here is reasons that I can think of:

[1] Anticipation of Segwit2x in November 16.
[2] CME news
[3] Amazon rumor that they are going to accept bitcoin as mode of payment.

So this fresh of positive news really bring investors to get bitcoin and invest on it because the price can go to the moon later. And the more positive news, the more bitcoin price picks up. But just remember that we can't always go up, sometimes a healthy correction is needed. Just enjoy this massive bull run before it hits the break.