U.S. stocks rose modestly at the open Thursday as oil prices surged on worries that wildfires raging in Alberta could hamstring crude output. The S&P 500 gained 2 points, or 0.1% to 2,053. The Dow industrials rose 29 points, or 0.2%, to 17,673. The Nasdaq Composite climbed 13 points, or 0.1%, to 4,740. Strong earnings from Tesla Motors Inc. and Alibaba Group Holdings Ltd. also helped boost shares.
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