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Here are today’s 10 weakest S&P 500 stocks

More evidence of a weakening economy in China sent shares of Freeport-McMoRan Inc., the world’s biggest copper miner, down as much as 8.3% Tuesday.

Another set of weak data out of China set up a rough start to September for U.S. stocks.

The Dow Jones Industrial Average dropped 470 points, or 2.8%, after China’s official manufacturing purchasing managers index fell to 49.7 in August from 50.0 in July. A level below 50 for a PMI indicates contraction.

Manufacturing activity in the United States continued to expand, but at its slowest pace in more than two years. The Institute for Supply Management said its U.S. Manufacturing Index declined to 51.1% in August from 52.7% in July.

“The slowest headline reading in more than two years is a clear reflection of a perfect storm for U.S. manufacturers including a weakening global environment and a rapidly rising dollar, as well as growing uncertainly in the market,” Stifel Nicolaus & Co. chief economist Lindsey Piegza said in a morning report.

On a more positive note, the Commerce Department said construction spending rose during July to its highest level in...