U.S. market prob...

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US stocks tumbled on Friday to close out the worst week since January as news of a criminal probe into Goldman Sachs unnerved investors already anxious about the prospects for heavy regulation from Washington.

US prosecutors in New York began an investigation into the investment bank, a source told Reuters, raising the possibility of criminal charges two weeks after the Securities and Exchange Commission accused the bank of fraud.

Goldman's stock fell 9.4% to USD 145.20, and the company has lost more than USD 20 billion of its market value since the SEC charges were filed. The S&P financial index slid 2.5%.