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Iran showed off the powerful new missile soon after its president Hassan Rouhani vowed to boost his nation's firepower.

Rouhani said that his country would not seek permission to "defend" itself in defiance of threats from US President Donald Trump.

Just hours later, Amirali Hajizadeh, head of Iran's Revolutionary Guard, announced the new ballistic missile, according to Tasnim news agency.

Pictures appearing to show the one tonne warhead, presented by Iran's Revolutionary Guard, are circulating on social media.

The missile stunt comes just days after Trump branded Iran a "murderous regime" in his inflammatory debut speech at the United Nations.

(Image: DS)

Trump took aim at the nuclear deal lifting sanctions on Iran, calling it an "embarrassment" that should be scrapped.

Iran promised to curb its nuclear programme in exchange for a loosening of economic sanctions as part of the historic deal.

But Trump has been a staunch critic of the deal, claiming it makes the US look weak on the international stage.

Speaking at a parade to mark Iran's war with Iraq, Mr Rouhani said: "We will increase our military power as a deterrent.

"We will strengthen our missile capabilities ... We will not seek permission from anyone to defend our country."

(Image: GETTY)

Earlier this week Iran claimed to have a weapon even bigger than America’s largest ever non-nuclear explosive – dubbed the “Father of All Bombs”.

Mr Rouhani has insisted that the nuclear deal cannot be renegotiated.

In his speech, he accused "rogue newcomer" Trump of being "ignorant and absurd" in his approach to relations.

Despite international condemnation, Iran's defense minister stated Tehran would not abandon its missile program.