Treasury prices are rising as fear about Europe's shaky financial situation returns to the market.
Traders questioned the Spanish government's ability to raise money in the bond market a day after a weak auction of Spanish debt. They sold bonds issued by Spain, Italy and other European nations perceived as having too much debt. Borrowing costs rose for Spain, Italy and France.
A sharp decline in U.S. and world stock markets Wednesday also freed up money for low-risk investments such as Treasurys.
The price of the 10-year Treasury note rose 22 cents for every $100 invested, pushing its yield down to 2.20 percent as of 10:45 EDT Thursday from 2.23 percent late Wednesday.