U.S. stocks opened lower on Tuesday as investors turned cautious following deadly attacks in Belgium that left more than 26 people dead and scores wounded. Travel stocks, such as American Airlines Group, Inc. and Expedia Inc were among hardest hit in early trade. The S&P 500 opened 8 points, or 0.4%, lower at 2,043. The Dow Jones Industrial Average slipped 50 points, or 0.3%, to 17,572. Meanwhile, the Nasdaq Composite began the day down 25 points, or 0.5%, at 4,783.
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