DONALD Trump has declared the US will “start shooting” if Iran’s tyrannical regime continues to murder protesters.

The president told reporters that the rogue nation was in “big trouble” as nationwide demonstrations grip the country.

TrumpPresident Donald Trump has repeatedly threatened military action against IranCredit: AP IRAN-JUSTICE-RIGHTS-PROTESTFootage shows protesters chanting anti-regime slogansCredit: AFP FILES-IRAN-JUSTICE-RIGHTS-PROTESTIran’s supreme leader Ayatollah Ali Khamenei insisted that the Islamic republic would ‘not back down’Credit: AFP

He added: “If they start killing people like they have in the past, we will be hitting them very hard where it hurts.

“That doesn’t mean boots on the ground but it means hitting them very, very hard where it hurts.”

Trump has already issued several threats to the despotic republic, claiming US forces were “” to assist protesters and prepared to hit its morality police ““.

More striking footage showing government buildings up in flames has emerged tonight.

Citizens have reported receiving threatening texts from totalitarian regime cops warning them against demonstrating.

Some protesters have been shot in the head with many injured also admitted for treatment, according to an eyewitness at an Iranian hospital.

The UK, France and Germany released a joint statement on Friday saying they “strongly condemn” the killing of protesters and that they are “deeply concerned” by reports of authoritarian violence.

for “ruining the streets” and sucking up to Donald Trump – as he faces a spiralling uprising against the mullah regime.

US intelligence initially believed the street protests would lack the necessary firepower to rock the regime, officials told Axios.

But after the latest dramatic scenes, that assessment is being torn up.

Millions of outraged protesters have marched through the streets of Tehran on Thursday night as Khamenei’s theocracy hangs in the balance.

Riots have spilled into over 100 towns and cities as the demonstrations enter their 13th consecutive day.

Quaking in his boots, the Iranian leader said: “Protesters are ruining their own streets to make the president of another country happy.”

The full extent of the damage is currently unclear due to Tehran cutting off the whole country from the internet and international phone calls.

But despite the blackout, dramatic footage showed cars up in flames as the widespread clashes left at least 45 people dead.

Bonfires and debris littered the streets as swarms of locals chanted slogans criticising the regime.

Furious civilians attacked government buildings and statues, including figures of once-revered military chief Qasem Soleimani.

Mosques in the Gholhak and Sa’adat Abad neighbourhoods of capital Tehran were reported to have been set on fire.

On Friday, Iranian state media broke its silence over the demonstrations.

Staring down the barrel of mob rule, they blamed “terrorist agents” from the US and Israel for lighting fires and sparking violence.

A building engulfed in flames with a traffic light in the foreground.Government buildings have gone up in flames in TehranCredit: X People gather on the streets amid anti-government unrest in TehranThe huge protests broke out at the end of last yearCredit: Reuters

In a seething televised address, the Supreme Leader fumed that authorities would crack down on demonstrators as an audience shouted behind him: “Death to America!”

The US president on Thursday promised to “come to the rescue” if Tehran “violently kills peaceful protesters”.

Trump said: “If they do that, they’re going to have to pay hell.”

Protests over Iran’s flailing economy and its government have intensified steadily since December 28.

There is mounting speculation that the Crown Prince Reza Pahlavi, whose father fled just before country’s 1979 Islamic Revolution, could be part of a regime change.

Demonstrations have shouted slogans in support of the shah – an act punishable by death.

Cries of “Death to the Dictator” filled the air as Khameinei’s rule came under the most serious threat since an eruption of violence was crushed in 2009.

At least 2,270 have been arrested in the demonstrations, according the US-based Human Rights Activists News Agency.

Protests-in-Iran-January-8The protests have sparked chaos across IranCredit: AFP FILES-FRANCE-IRAN-JUSTICE-RIGHTS-PROTESTIranian opposition leader and son of the last shah of Iran Mohammad Reza PahlaviCredit: AFP