US STOCKS-Wall St down as China currency move stokes growth fears
* Commodities fall as cheaper yuan boosts dollar
* Eight of 10 S&P sectors down, energy stocks weigh
* Industrials and materials stock also hit
* China uncertainty weighs on Apple, GM, Caterpillar
* Indexes down: Dow 1.2 pct, S&P 0.96 pct, Nasdaq 0.95 pct (Adds quote, updates prices)
By Sweta Singh
Aug 11 (Reuters) - U.S. stocks fell in morning trading on Tuesday in a broad retreat, with the Dow down more than 1 percent, as China's surprise devaluation of the yuan pushed the dollar higher and pressured commodity-related stocks.
The yuan fell to its lowest against the dollar in almost three years following what China's central bank described as a "one-off depreciation" that increased unease about the health of the country.
Brent crude was down 3 percent and U.S. crude fell 4 percent following the devaluation by the world's top energy consumer. Prices of commodities such as copper, aluminum, nickel, and zinc slid between 2 and 3.5 percent. Continuación...