Yellen may help pave way for higher rates on Friday
May 27, 2016 at 10:51 AM EDT
WASHINGTON (Reuters) - Federal Reserve Chair Janet Yellen has struck a largely cautious tone since engineering the U.S. central bank's rate hike last December, saying she was not convinced inflation had taken firm enough hold to justify a second move and that she was worried a weak global economy put the United States at some risk.