U.S. consumer prices accelerated in August as gasoline costs rebounded after two straight monthly declines, increasing market expectations that the Federal Reserve may raise interest rates next week. The consumer price index rose 0.4% month-on-month in August after a 0.1% increase in July, while annual inflation held at 3.4%. The move followed a rise in August producer prices and a strong employment report, with markets estimating the probability of a Fed rate hike next week at around 90%.