nternational oil prices, driven by profit-taking operations and prospects for oil demand trends soft 17 crash, New York and London, oil prices fell more than 2%. 

The market was expecting the U.S. Federal Reserve's new round of quantitative easing monetary policy to promote the international oil prices will continue to rise after rising for two days. Day, the international oil price shock in the morning was up fell, mainly because many investors choose to sell at a high profit-taking. 

And the same day a series of negative economic news from the United States, Europe and China also increased market concerns about the status of global oil demand. 

Federal Reserve Bank of New York released the same day the New York area manufacturing index for September, the second consecutive month decline, negative 10.41 show shrinking manufacturing sector. Cyprus meeting of the eurozone finance ministers also results do not solve the prospect of the European debt crisis once again slim. Citigroup China's 2013 economic growth is expected to cut the day that the world's second-largest economy next year's economic growth rate of 7.6%, rather than the previous forecast of 8%. 

According to another trader said, the day of an important reason for the decline in international oil prices is instantaneous sell-off. About 1:50 the afternoon of the same day, U.S. crude oil futures and Brent crude oil futures are faced with instantaneous massive sell-off, led to the decline in oil prices within a short time of two places up to about $ 5. Some traders speculated the instantaneous sell-off may be caused by trading errors. 

In addition, the United States and other countries has not given up the idea to spend the strategic oil reserves, but also constitute a pressure on oil prices. 

But traders also pay close attention to the situation in the Middle East. Continuing anti-American demonstrations as well as the ever-tightening relationship between Iran and Israel, pose a potential threat to all the region's oil production may affect global oil supply. 

To close the day, the New York Mercantile Exchange, light sweet crude for October delivery fell $ 2.38 to close at $ 96.62 a barrel, down 2.40%. The price of Brent crude oil futures fell $ 2.87 to settle at $ 113.79 a barrel, down 2.46%.