Federal Reserve Chairman Ben Bernanke cited significant risks to the U.S. economic recovery but stopped short of signaling Fed action to combat them, during testimony on Capitol Hill Thursday.

When asked whether the Fed is planning to take more measures to boost growth, Mr. Bernanke said he and his colleagues "are still working" on that question ahead of their June 19-20 meeting. The main question they need to answer, he said, is whether the economy will be strong enough to make material progress on bringing down unemployment.

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