NEW YORK (AP) -- Treasury prices rallied dramatically Monday on more credit concerns, pushing the benchmark 10-year note's yield down to its lowest level in two and a half years.

Trading was dominated by a fresh set of worries about the impact of deteriorating below prime home loans on the credit and housing sectors; those concerns led investors away from risk and to again seek the safety of government bonds.

HSBC Holdings PLC Monday said it will move two of its structured investment vehicles, which contain some asset pools with exposure to sour home loans, onto its balance sheet. In the past many banks have kept structured investment vehicles off their balance sheets, obscuring their subprime problems.

HSBC also said it will provide up to $35 billion in funding for the SIVs. HSBC doesn't expect a near-term resolution of the funding problems faced by the vehicles that it and other banks hold.

There also are concerns that Citigroup Inc. needs to put its collateralized debt obligations onto its balance