US STOCKS-Wall St falls as energy, materials stocks drag
* Fall in commodity prices weigh on materials, energy shares
* Weekly jobless claims data supports Dec. rate hike
* Yellen says Fed must weigh post-crisis policy
* Kohl's quarterly results boosts retailers
* Indexes down: Dow 0.82 pct, S&P 0.65 pct, Nasdaq 0.59 pct (Updates to open)
By Abhiram Nandakumar and Yashaswini Swamynathan
Nov 12 (Reuters) - U.S. stocks were lower on Thursday morning as materials and energy stocks sank due to lower commodity prices and investors weighed the prospect of an increase in interest rates next month.
The selloff was broad based with all 10 major S&P sectors in the red and only 5 of the 30 Dow components were higher.
Fed Chair Janet Yellen said that the central bank must weigh the effects of post-crisis financial regulations and new channels through which policy affects markets as it prepares to raise interest rates. She did not comment on the rate hike timing or the U.S. economy. Continuación...