Chinese forex kitty aids US moves

China's foreign exchange reserves are surging again, helping the Obama administration sell unprecedented amounts of debt as it seeks to drag the world's biggest economy out of a recession.

Stockpiles of currency rose by a record $178 billion in the second quarter to top $2 trillion for the first time, the People's Bank of China said on Wednesday. The amount is close to two-thirds the size of China's economy and the equivalent of Italy's gross domestic product in 2006.

The cash holdings are growing as the central bank sells its currency, the yuan, to prevent an appreciation that would make the country's exports more expensive.