US STOCKS-Wall St tumbles as investors run to safety
* All 10 S&P sectors fall, led by financials
* Banks stocks weigh the most
* Cisco up after results; only gainer on Dow
* Indexes down: Dow 1.56 pct, S&P 1.44 pct, Nasdaq 1.32 pct (Updates to open)
By Abhiram Nandakumar
Feb 11 (Reuters) - U.S. stock indexes plummeted on Thursday morning as investors spooked by the health of the global economy jettisoned stocks and fled to safe-haven assets.
All three major indexes were down more than 1 percent, led by financials, especially banks. All 10 major S&P sectors were lower.
Federal Reserve Chair Janet Yellen on Wednesday acknowledged tightening financial conditions and uncertainty about China and the risks that posed to the U.S. economy, but still kept open the possibility of further interest rate hikes.
Globally, stocks fell sharply on Thursday. The dollar hit a 16-month low against the yen and investors migrated to gold and top-rated bonds. U.S. Treasury security yields plunged to levels not seen since 2012 in some cases. Continuación...