U.S. stocks headed south at the open Tuesday as investors digested China's surprise devaluation of the yuan overnight. The Dow Jones Industrial Average fell 152.9 points, or 0.9%, the S&P 500 shed 14 points, or 0.7%, at 2,087, while the Nasdaq Composite Index was off 37 points, or 0.7%, to 5,080.52. The downdraft for stocks comes after the Dow snapped a seven-day losing streak as the prospects for a September rate-hike dimmed and a big $32 billion acquisition of Precision Castparts Corp. by Warren Buffett's Berkshire Hathaway holding company inspired optimism Monday.
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