Source: CNBC

Stock markets around the world tumbled as investors took in news about Lehman Brothers' bankruptcy, Bank of America's buyout of Merrill Lynch and challenges at AIG. The U.S. stock market experienced the biggest daily point drop since the day the market reopened after the terrorist attacks of Sept. 11, 2001. Jittery investors are selling off stocks of everything from large conglomerates to regional banks and insurers on concerns about the companies' exposure to the credit crisis.

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