NEW YORK Stocks plunged in the final minutes of trading Thursday, sending the Dow Jones industrials down more than 600 points to their lowest level in five years after a major credit ratings agency said it was considering cutting its rating on General Motors Corp. The Standard & Poor's 500 index fell more than 7 percent. The selloff came as Standard & Poor's Ratings Services put GM and its finance affiliate GMAC LLC under review to see if its rating should be cut. GM has been struggling with weak car sales in North America.
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