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Fed Chair Janet Yellen holds a news conference after the central bank took the first tentative steps Wednesday to unwind its history-making economic stimulus.

As markets expected, the U.S. central bank announced it will begin in October rolling off its $4.5 trillion balance sheet, most of which consists of the Treasurys and mortgage-backed securities it acquired under a program known as quantitative easing.

--CNBC.com's Jeff Cox contributed to this report.