US Treasury says the bonds are needed to manage rising debt levels
The United States government plans to sell bonds worth $55bn (£34bn) next week in an effort to finance its bank rescue programme.
In a first $25bn auction on Monday, the Treasury Department will launch a new type of bond, which will reach maturity after three years.
The rest of the amount will be raised later next week through the sale of traditional 10-year and 30-year bonds.
US bonds earn a fixed rate of interest every six months until maturity.
