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The prospect of a downgrade in the UK government's credit rating and mixed signals on the state of the US economy sent stocks on Wall Street for a third day.
The Dow Jones Industrial Average declined 129.91 points, or 1.5%, to close at 8292.13, and the S&P 500-stock index slid 15.14, or 1.7%, to 888.33.
Both benchmarks were weighed down by losses in their most economically sensitive components. Alcoa, Schlumberger and Deere all slid at least 4.9% on concern a lingering recession will reduce demand for materials, energy and machinery.