U.S. stocks opened slightly lower on Friday as investors remained cautious ahead of the looming vote in the U.K. on whether or not to remain in the European Union. The campaigning has been on hold for a second day following an attack that killed British lawmaker Jo Cox on Thursday. The S&P 500 opened 4 points, or 0.2%, lower at 2,073. The Dow Jones Industrial Average slipped 21 points, or 0.1%, to 17,713. Meanwhile, the Nasdaq Composite began the session down 14 points, or 0.3%, at 4,830.
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