Economic security.

Wall Street stocks dip after Chinese market tumbles

A 6.0 percent tumble in Chinese shares on Tuesday, and weak earnings from Wal-Mart pressured U.S. stocks and copper prices saw six year lows.

Chinese stocks earlier plunged on concerns that companies may pull more money out of China as economic growth slows, lowering earnings for U.S. and European companies dependent on revenue from China.

The Shanghai Composite Index .SSEC closed down 6.1 percent at 3,749.12 points in its biggest daily decline since July 27, after recovering for three days. The CSI300 index .CSI300 of the largest listed companies in Shanghai and Shenzhen fell 6.2 percent at 3,825.41.