I very much hope that this is a false alarm:
"A sharp drop in foreign holdings of US Treasury bonds over the last five weeks has raised concerns that China is quietly withdrawing its funds from the United States, leaving the dollar increasingly vulnerable.
Data released by the New York Federal Reserve shows that foreign central banks have cut their stash of US Treasuries by $48bn since late July, with falls of $32bn in the last two weeks alone.
"This comes as a big surprise and it is definitely worrying," said Hans Redeker, currency chief at BNP Paribas.
"We won't know if China is behind this until the Treasury releases its TIC data in November, but what it does show is that world central banks are in a hurry to get out of the US. They don't seem to be switching into other currencies, so it is possible they are moving into gold instead. Gold is now gaining momentum across all currencies and has broken through resistance at 500 euros," he said.
Any evidence that China was pulling out would risk setting off an unstoppable stampede, which is why such a policy would never be announced. It holds the world's biggest pool of resrves, followed by Japan."
Brad Setser, from about a month ago:
"China’s holdings of US bonds are hard to discern in a real time basis, but if China kept the dollar share of its reserves roughly constant at 70%, its $1.34 trillion in central bank reserves – along with at least another $100b stashed away in the state banks – imply that China now holds about a trillion dollars worth of US bonds."
That's an awful lot of bonds. It'd be a shame if something happened to them.
http://www.telegraph.co.uk/money/main.jhtml?xml=/money/2007/09/05/bcnchina105.xml