"The full strength and might of the U.S. Armed Forces will come down on you at levels never seen before," Trump warned.

Tehran said American bases in the Middle East could face reprisals if the U.S. helped repel Iranian attacks on Israel.

Iranian state media has threatened to strike military bases and ships belonging to the UK, US and France if those countries help Israel defend against retaliatory missile strikes, declaring there would be 'grave and far-reaching consequences' if these countries were 'supporters' of Israel in this conflict.

The two powers have been exchanging barrages since Israel attacked Iran and killed many of the country’s top military leaders and scientists.

Britain is sending more RAF jets to the Middle East after Iran threatened to target British, French and American bases if they help Israel fend off Iranian strikes. Iranian state media said Tehran had warned it would target US,

Tensions in the world are rising as Iran has made a threat against the UK following missile strikes against Israel, let's hope it's not WW3

CAIRO (Reuters) -Iran said on Friday the dialogue with the U.S. over Tehran's nuclear programme is "meaningless" after Israel's biggest-ever military strike against its longstanding enemy, accusing Washington of supporting the attack.