The Federal Reserve is unlikely to reverse its plan to raise interest rates further this year, but tighter credit markets, volatile financial markets, and uncertainty over Chinese economic growth have raised risks to the U.S. economy, Fed Chair Janet Yellen told U.S. lawmakers on Wednesday. Yellen said she expected continued U.S. economic growth would allow the Fed to pursue its plan of "gradual" rate hikes, but her comments kept the central bank's options open. Stock indexes worldwide recovered some ground before ending little changed on Wednesday after Yellen's comments eased concerns about the likely path of U.S. interest rates. Worries about Chinese economic growth, poor U.S. fourth quarter corporate earnings, and the impact on capital spending and employment in the energy sector of the slump in oil prices, have roiled global markets in the past month. The dollar was broadly lower early on Thursday after comments from Federal Reserve Chair Janet Yellen gave investors no reason to change their minds that the next rate hike will be a long time coming. That gave currency investors the green light to continue the current trading theme; buy the safe-haven yen. As a result, the dollar came within a whisker of 113.00 yen, reaching a low not see since November 2014. It was last at 113.49. The euro also weakened against its Japanese peer, sliding to a near three-week low of 127.74 yen. It has since edged back to 128.00. Against the dollar, the common currency held near $1.1300 and stayed within reach of a three-month high of $1.13385 set earlier in the week.