There’s no indication that a strike is imminent, but with the U.S. evacuating diplomatic posts, Iran threatening to hit U.S. installations and Israeli officials scheduling emergency meetings with the U.S. Middle East envoy, officials in the region and in Washington are on alert.

Israel is considering launching a military strike against Iran in the coming days - even without support from the United States amid faltering diplomatic efforts to curtail Iran's nuclear programme, according to multiple US media reports.