Stock Market Tumbles as Selloff IntensifiesU.S. stocks were mired in a broad selloff on Monday as investors shed risky assets, sending the Dow Jones Industrial Average down by more than 634 points.SavePrintFrank Yu8/8/2011|Updated: 10/1/2015We had a problem loading this article. Please enable javascript or use a different browser. If the issue persists, please visit our help center.