Gas prices fell in March. (Tom Merton/Getty Images)

WASHINGTON — U.S. inflation declined last month as the cost of gas fell, a sign that price growth was cooling even as President Donald Trump ramped up his tariff threats.

Consumer prices rose just 2.4% in March from a year earlier, the Labor Department said April 10, down from 2.8% in February. That is the lowest inflation figure since September.

Excluding the volatile food and energy categories, core prices rose 2.8% compared with a year ago, down from 3.1% in February, the second straight decline. Economists closely watch core prices because they are considered a better guide to where inflation is headed.

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The report shows that inflation is mostly cooling after remaining stubbornly elevated through the fall and winter. Core prices were stuck at 3.3% for five months before slowing in February. Still, most economists expect that remaining tariffs could lift prices a bit later this year.

Trump had imposed sweeping tariffs on nearly 60 nations last week, which sent financial markets into a tailspin and caused sharp drops in business and consumer sentiment. Yet on April 9 he paused those duties for 90 days. He kept a steep 125% tariff on all imports from China and 25% duties on steel, aluminum, imported cars, and many goods from China and Mexico.

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The remaining duties are still likely to lift inflation this year, economists say, even with the 90-day pause on some tariffs.

The delay of the sweeping tariffs will likely limit upcoming price increases and has reduced the chances of a recession, economists say. Yet the uncertainty surrounding whether the duties will be imposed will continue to weigh on the economy.

“There’s a lot of waiting and seeing going on, including by us,” Powell said. “And that just seems like the right thing to do in this period of uncertainty.”