Stock market endures worst day in 18 months

The U.S. stock market endured its worst performance in 18 months on Thursday, driven lower by another slump in Chinese shares and heavy selling by technical traders. The global rout started in China, where sharp declines in energy and property stocks pushed the Shanghai Composite down more than 3 percent. That selling soon spread to European and U.S. markets, where the Standard & Poor's 500 index moved further below a closely watched trading level.  







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