The warning comes after US President Donald Trump said Washington could strike Iran again if no deal on a lasting settlement is reached in the coming days.

The two sides have escalated their threats while swapping proposals to end the war, which broke out on 28 February. A ceasefire has been in place since 8 April.

"The American-Zionist enemy... must know that despite the offensive carried out against us using the full capabilities of the world's two most expensive armies, we have not deployed the full power of the Islamic revolution," the Guards said.