Urgent: U.S. stocks plummet following global rout

U.S. stocks continued to plunge Friday, with the Dow Jones Industrial Average nosediving more than 500 points, as a broad-based heavy sell-off in global stock markets rattled nervous investors.

The Dow shed more than 3.1 percent, and the S&P 500 slumped 3.2 percent, while the Nasdaq sank 3.5 percent. Endit