U.S. stocks ended lower Tuesday, snapping a five-day winning streak, as plunging crude oil prices weighed on energy shares. The S&P 500 shed 22.42 points, or 1.1%, to 1,979.31. The Dow industrials dropped 110.70 points, or 0.7%, to 16,963.42 -- with Caterpillar Inc. and Chevron Corp. among the average's biggest losers. The Nasdaq Composite slid 59.43 points, or 1.3%, to 4,648.82. The bulk of the losses occurred during the last hour of trading.
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