German 10-year bunds stayed lower after Federal Reserve Chairman Ben S. Bernanke said he wouldn’t rule out further bond purchases to boost growth and reduce unemployment, which he called a “grave concern.”

The nation’s 10-year yield was five basis points higher at 1.37 percent as of 3:09 p.m. London time. The five-year rate was also five basis points higher at 0.37 percent.

Bernanke was speaking today in a speech to central bankers and economists at an annual forum in Jackson Hole, Wyoming.

To contact the reporter on this story: David Goodman in London at dgoodman28@bloomberg.net

To contact the editor responsible for this story: Paul Dobson at pdobson2@bloomberg.net