A key U.S. inflation gauge slowed last month as President Donald Trump's tariffs have yet to noticeably push up prices, while American incomes jumped.

Friday's report from the Commerce Department showed that consumer prices rose just 2.1% in April compared with a year earlier, down from 2.3% in March and the lowest since September. Excluding the volatile food and energy categories, core prices rose 2.5% from a year earlier, below the March figure of 2.7%. Economists track core prices because they typically provide a better read on where inflation is headed.