By Lucia Mutikani WASHINGTON, Sept 11 (Reuters) - U.S. consumer prices accelerated in August, while a key measure of underlying inflation posted its largest increase in four months, reinforcing

US core producer prices rose less than expected in August, complicating the Federal Reserve's rate decision ahead of the September 15-16 FOMC

US consumer inflation came in unchanged at 3.4 percent in August, government data showed Friday, with persistent high prices raising expectations that the Federal Reserve will…