Investors are also fearing consumer price data to be released at 8:30 am EDT (1230 GMT) may show signs that inflation is accelerating.

Thirty-year bonds were last up 1-20/32 in price to yield 3.48 percent, down from 3.57 percent late on Wednesday. Ten-year notes were last up 22/32 in price to yield 2.09 percent, down from 2.18 percent.

Copyright Reuters, 2011