S&P/TSX falls more than 100 points as U.S., China tensions flare

Canada's main stock index took its biggest tumble in nearly six weeks on Wednesday, while American markets fell even harder under pressure from rising U.S. Treasury yields amid worries about the U.S. government's spiralling debt. The S&P/TSX composite index fell 216.46 points at 25,839.17, its largest slide since April 10. In New York, the Dow Jones industrial average dropped 816.80 points to 41,860.44. The S&P 500 index decreased 95.85 points to 5,844.61, while the Nasdaq slipped 270.07 points to 18,872.64. Stocks had been drifting only modestly lower earlier in the day, after Target and other retailers gave mixed forecasts for…