Wall St. falls as commodities weigh

Crude oil prices hit 2-1/2 month lows, while copper and other metal prices tumbled to more than six-year lows, weighed down by a strong dollar, weak Chinese data and concerns about oversupply. Investors are also keeping a watchful eye on whether the Fed will raise interest rates off near-zero levels in December, a possibility Fed Chain Janet Yellen alluded to last week. Yellen said on Thursday the Fed must weigh impact of the new financial market landscape, but did not comment on the economy or