U.S. consumer prices increased by the most in nine months in October amid gains in the cost of gasoline and rents, pointing to steadily rising inflation that likely will keep the Federal Reserve on track to raise interest rates again next month.

Though overall inflation could slow in the months ahead following a recent slump in oil prices, economists said Fed officials were likely to regard any retreat as temporary and focus on underlying price pressures.

The U.S. central bank, which has a 2 percent inflation target, left interest rates unchanged last Thursday after a two-day policy meeting. In its policy statement, the Fed noted that annual inflation measures "remain near 2 percent."