From reddit:
There's some manipulation going on in the US. I say manipulation but I dont really know what it is: I invest mainly in EU stocks and this morning they were doing fine (around -1%/+1%, nothing massive). As soon as the US market opened all of them, whitout exception, started collapsing. Only red candles for 1 hour! Some of them went -5%, most of them about -3%. The exact same thing happened yesterday! So either US retail are scared and dumping everything they own or banks are playing some game with EU stocks!
Presented without comment.