Iran has made a new threat (Image: Getty)

Iran has threatened to unleash "hell" on the US and Israel in new attacks, as Tehran prepares for a resumption of the war. According to the Tasnim news agency, Iran is "fully prepared" for the conflict to resume after the two-week ceasefire ends on Wednesday, as the US naval blockade in the Strait of Hormuz remains.

Tehran has reportedly prepared military redeployment and a list of new targets should the war continue later this week, which it sees as a "strong possibility". Tasnim reported: "On this basis, Iran is prepared to create another hell for the Americans and Israelis from the very first second of a potential war."

Iran is reportedly preparing for the war to resume. (Image: Getty)

Iranian Armed Forces Khatam al-Anbiya Headquarters commander Ali Abdollahi Aliabadi also said the country is ready to "give a decisive response" to any US "breach of promise".

Aliabadi also warned that Tehran would respond "decisively, conclusively, and immediately" to any threats or breach of the ceasefire from the US.

This comes after Mr Trump extended the ceasefire deadline by one day as the progress of follow-up negotiations in Pakistan remains uncertain.

Washington and Tehran agreed to a two-week ceasefire on the evening of April 7, which would have required the warring nations to reach a deal by Tuesday, April 21.

However, the US President granted negotiators an additional day to secure an agreement, as Iranian officials have yet to formally commit to sending a delegation to Islamabad.

Following the announcement of the extension, he cautioned Iran that it is "highly unlikely that I'd extend it" again, having repeatedly shifted his position on prolonging the ceasefire.