US stocks plunged for a second day in a row Friday, clobbered by fears of slowing economic growth around the world that could threaten one of the longest-running bull markets in history. The sell-off followed sharp declines in Asia and Europe.
The Dow Jones industrial average sank 530.94, or 3.1 percent, to 16,459.75, the biggest percentage-point loss since November 2008. The widely followed index of 30 stocks lost 6 percent over the week, the steepest drop since 2011.
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