The claim is strongly supported by Reuters and CoinDesk. Reuters' article, "US consumer inflation hot in March amid record surge in gasoline prices | Reuters," states that CPI jumped 0.9% in March, core CPI rose 0.2%, and gasoline accounted for nearly three quarters of the monthly increase. Reuters explicitly ties the gasoline and diesel surge to the war with Iran. CoinDesk's article reports the same topline figures and similarly says headline inflation was driven by energy costs due to the Iran war. Together, these sources support the statement that headline inflation rose 0.9% and that the increase was driven by a sharp rise in energy prices linked to the Iran war.