US STOCKS-Wall St stocks volatile after Fed holds steady on rates
* Fed leaves rates unchanged amid global concerns
* Fed Chair Yellen to take questions at 2.30 PM
* Trading volatile after Fed statement
* Indexes up: Dow 0.09 pct, S&P 0.13 pct, Nasdaq 0.30 pct (Adds comment, updates prices, changed byline)
By Sinead Carew
Sept 17 (Reuters) - U.S. stocks were up in volatile afternoon trading on Thursday after the Federal Reserve held off on raising interest rates in a nod to concerns about global economic weakness.
The U.S. central bank said an array of global risks and other factors had convinced it to delay what would have been the first rate hike in nearly a decade.
The focus will now move to the next Fed meeting on Oct. 27-28. Fed Chair Janet Yellen was due to hold a press conference at 2:30 p.m ET (1830 GMT).
Afternoon trading was choppy and the three major U.S. indexes were up less than one percent after hitting session highs and then briefly turning negative after the news. Continuación...