The Chinese sell-off of US bonds follows increasingly vocal concern from Beijing over the ballooning US deficit, and comes amid a deterioration in relations between the US and China on a range of fronts.
Eswar Prasad, a trade policy professor at Cornell University in New York state, said the Chinese sales of US Treasuries could contain "a subtle economic and political message" aimed at Washington.
"Chinese leaders are deploying their reserves to try and pressure the US to stop haranguing China about its currency and trade policies and to back off from interference in its domestic political and human rights issues," he told the AFP news agency.
In the latest spat between Beijing and Washington the White House has rejected a Chinese demand that Barack Obama, the US president, cancel his meeting this week with the Dalai Lama, the exiled Tibetan spiritual leader.
Complicating issues still further the rows over Tibet, a US arms sales to Taiwan, China's dispute with Google and a raft of others trade and currency disagreements, come at a time when Obama is seeking China's help to toughen sanctions on Iran.
However, US think-tank Stratfor in a note to clients on Tuesday said that while the debt sell-off may have political undertones, China remains fully aware of its own dependence on the US.
"While China may reduce its holdings of US debt in order to send a signal to Washington - though this is not necessarily the only reason it would do so - it has no intention of selling debt to the point that it wrecks the US economic recovery, since doing so would destroy China's own economic and socio-political stability," it said.
|Analysts have speculated about political motives behind China's move [GALLO/GETTY]
China invests the bulk of its $2.2trn in foreign exchange reserves in US Treasury bonds which has virtually financed the snowballing US budget and current account deficits.
At the same time, despite recent increases in China's domestic consumption, its economy and millions of Chinese factory jobs remain highly dependent on US export markets.
Nonetheless, in recent months Chinese officials have repeatedly voiced concern about the mushrooming US debt, fearing it could erode the value of the dollar and its Treasury holding.
Last June Timothy Geithner, the US Treasury Secretary, travelled to Beijing to reassure Chinese leaders, saying their money is "very safe" and pledging to cut the deficit.