Traders in the 10-year bond options pit at the Chicago Board of Trade signal orders.

U.S. government debt prices fell on Friday as a speech from a key Federal Reserve official sparked concerns the central bank may raise rates sooner rather than later.

Boston Fed President Eric Rosengren said in a speech low interest rates are increasing the chance of overheating the U.S. economy. Gradually tightening monetary policy is appropriate to maintaining full employment, he added.