(From Reuters)

China heightened fears of a slowdown in the world’s second-largest economy and its effect on global growth.

All three major indexes were down about 2 percent just after the start of trading.

Data showed that China’s manufacturing sector shrank at its fastest pace in three years. The services sector, one of the lone bright spots in the country’s economy, also showed signs of cooling.

China’s official manufacturing Purchasing Managers’ Index (PMI) fell to 49.7 in August from 50.0 in July.

“The PMI was below 50, which is a psychologically important level and puts into real focus the fact that China is contracting,” said Joe Rundle, a senior sales trader at ETX Capital.

“With the weak data coming out, we’re going to see the negative sentiment from the last few weeks continuing.”

Growth in the U.S. manufacturing sector slowed to its weakest pace in almost two years in August, according to a report from financial data firm Markit.

Adding to the nervousness, International Monetary Fund head Christine Lagarde said global economic growth was now likely to be weaker than had been expected just a few months ago.

At 9:42 a.m. ET (1342 GMT) the Dow Jones industrial average .DJI was down 344.01 points, or 2.08 percent, at 16,184.02. The S&P 500 .SPX was down 39.55 points, or 2.01 percent, at 1,932.63 and the Nasdaq composite .IXIC was down 85.37 points, or 1.79 percent, at 4,691.14.

All the 10 major S&P sectors were lower with the energy index’s .SPNY 2.93 percent fall leading the decliners. Oil prices fell more than 4 percent, snapping three days of strong gains, after the weak data from China. Oil majors Chevron (CVX.N) and Exxon (XOM.N) were down about 3 percent. [O/R]

Wall Street ended lower on Monday and wrapped up its worst month since 2012 after Federal Reserve Vice Chairman Stanley Fischer’s comments appeared to indicate a U.S. interest hike ths month.

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