U.S. stocks tumbled Thursday as investors grew fearful that the electric global economic rebound could be slowing. The Dow was 380 points, or 1.1%, lower. The S&P 500 dropped 1.2% and the Nasdaq Composite sank 1.3%. Oil prices fell for the third-straight day, and bitcoin (XBT) dropped more than 4%. International stock markets were also sharply lower. Read more at CNN Business.