US inflation rose in April to 3.8 per cent as surging fuel costs amid the ongoing Iran-US conflict drove up consumer prices, hitting a three-year high complicating the Federal Reserve’s path on interest rates.Data released by the Labor Department on Tuesday showed the Consumer Price Index (CPI) increased 0.6 per cent in April after a 0.9 per cent jump in March, the biggest monthly rise since June 2022. On an annual basis, inflation accelerated to 3.8 per cent, marking the highest year-on-year increase, since May 2023.Petrol prices in the US are now more than 28 per cent higher than a year ago, according to official data. AAA estimates show average gasoline prices have crossed $4.50 per gallon, roughly 44 per cent above year-ago levels, squeezing household budgets and raising concerns about broader economic fallout.The spike in energy prices follows the escalation of hostilities between the US, Israel and Iran earlier this year. Markets were rattled after Tehran blocked access through the Strait of Hormuz — a critical global energy route that handles nearly one-fifth of the world’s oil and liquefied natural gas supplies.Core inflation, which excludes food and energy prices, remained relatively contained. Core CPI rose 0.4 per cent month-on-month and 2.8 per cent annually, suggesting that higher fuel costs have not yet fully spread across the wider economy.Food prices also edged higher in April. Grocery costs rose 0.7 per cent from March, led by increases in meat prices after a slight decline in the previous month.The latest inflation reading adds to uncertainty for the Federal Reserve, which had earlier been expected to begin cutting interest rates in 2026. Policymakers are now signalling caution amid fears that prolonged geopolitical tensions and elevated oil prices could trigger another wave of inflation.US President Donald Trump has repeatedly criticised the Fed for not lowering borrowing costs faster to support economic growth. Attention is now turning to Kevin Warsh, Trump’s nominee to succeed outgoing Federal Reserve Chair Jerome Powell, whose Senate confirmation is expected this week.Higher fuel costs are also beginning to weigh on corporate America. Appliance maker Whirlpool Corporation said last week that quarterly revenue fell nearly 10 per cent, warning that the war-driven economic slowdown had severely dented consumer confidence.