China, the largest foreign lender to the U.S., reduced its holdings of Treasuries in December to the least since June 2010 amid efforts to assist Europe in addressing its debt crisis.

The world's second-largest economy decreased its U.S. debt securities by $31.9 billion from November, or 2.8 percent, to $1.11 trillion, according to Treasury Department data released yesterday. Its position in longer-term notes and bonds also fell $32.5 billion, or 2.8 percent, to $1.1 trillion, the least since June 2010. Japan, the second biggest buyer, increased its holding by $3.5 billion to $1.04 trillion.

"We continue to see Chinese Treasury holdings trending lower as they are acting on their desire for diversification and as they may get more involved in the situation in Europe," said Ian Lyngen, a government bond strategist at CRT Capital Group LLC in Stamford, Connecticut.