World stock indexes and commodities dropped yesterday as weak Chinese data revived fears about the effect of China's economic health on the global economy and fueled more market turmoil.

Oil prices fell more than 7 per cent on concerns about global demand for petroleum, reversing a three-day rally that had pushed US crude up 27.5 per cent.

All three major US stock indexes were down more than 2 per cent, led by declines in energy shares, and were in negative territory for the year. The S&P 500 is now down 6.6 per cent for the year so far.

The CBOE Volatility index, known as Wall Street's "fear gauge," was up 10.4 per cent at 31.41, above its long-term average of 20. The index had spiked to 53.29 last Monday.

The moves followed a stormy week in the markets, when investors became increasingly concerned about further losses due to slowing growth in China.

The selloff in equities last week raised doubts about earnings and growth while fueling worries about whether central bank support could make a difference after years of loose policy around the globe.

Surveys showed China's manufacturing sector shrinking at its fastest pace in three years while its services sector also cooled.

Adding to economic worries, data showed US factory activity hit a more than two-year low in August.

The Dow Jones industrial average fell 406.88 points, or 2.46 per cent, to16,121.15, the S&P 500 lost 48.73 points, or 2.47 per cent, to 1,923.45 and the Nasdaq Composite dropped 105.37 points, or 2.21 per cent, to 4,671.14.

MSCI’s all-country stock index fell 2.4 per cent and is down 7.1 per cent for the year to date. The pan-European FTSEurofirst 300 stocks index closed down 2.8 per cent.

Asian stocks, particularly in Japan, fell overnight.

In the oil market, Brent crude dropped $3.24 to $50.91 a barrel. US crude was down $3.10 at $46.10 a barrel.

While shares and commodities remained the focus, the mood was similarly wary in the currency and bond markets.

US short- and medium-term Treasuries prices rose, with benchmark 10-year yields hitting a session low of 2.15 per cent after reaching a 1-1/2-week high of 2.22 per cent on Monday. The 10-year note was last up 6/32 in price.

The dollar sagged against the safe-haven yen and low-yielding euro as the Chinese data drove investors to unwind bets against the two currencies widely used to fund positions in riskier assets.

The dollar fell more than 1 per cent to 119.9 yen, while the euro rose 1 per cent to $1.1332.

Russia’s ruble was among the hardest-hit emerging market currency as the price of oil fell.

Spot gold rose to a session high of $1,147.16 an ounce and was up 0.9 per cent at $1,144.42 an ounce.

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