WASHINGTON (AP) — A key inflation measure jumped in March as gas prices soared, the latest sign that the Iran war is pushing up the cost of living and delaying any interest rate cuts by the Federal Reserve.

An inflation gauge monitored by the Fed rose 0.7% in March from February, up sharply from the previous month, the Commerce Department said Thursday. Compared with a year ago, prices rose 3.5%, the biggest increase in almost three years.

Excluding the volatile food and energy categories, core inflation rose 0.3% in March from February, and it was 3.2% higher than a year earlier. The annual figure is above February’s reading of 3%.

The jump in gas prices has pushed inflation further away from the Fed’s 2% target. Outgoing Fed Chair Jerome Powell signaled at a news conference Wednesday that the central bank would likely be on hold for months as it evaluates the impact of the Iran war. The Fed has kept its key short-term interest rate unchanged after cutting it three times last year. The central bank typically keeps rates elevated — or even raises them — to combat higher inflation.

At the same time, Thursday’s report showed that Americans’ incomes — wages, business income, and government benefits — increased 0.6%, a solid increase but slower than the rate of inflation, for the second straight month.