If the economy continues to strengthen, the Fed's plan to buy $600 billion of longer-term Treasury securities may end early, Federal Reserve Bank of Philadelphia president and chief executive officer Charles Plosser said Wednesday.

"Should economic prospects continue to strengthen, I would not rule out changing the policy stance to bring QE2 to an early close," Plosser told the Rotary Club of Birmingham, Ala., according to prepared text of his speech released by the Fed.

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