Iran made terrifying warning to Donald Trump about what would happen if he bombed its nuclear facilities

Iran reportedly made its stance clear on what it would do to the US if Trump attacked the nation in the days leading up to the weekend's strikes on nuclear bases.

Yesterday, the world woke up to the news that the US president has bombed three major nuclear sites in Iran, a week after conflict was sparked after the country was attacked by Israel with missiles.

Over the weekend, the 79-year-old 'totally obliterated' nuclear bases in Fordow, Natanz and Isfahan.

Days earlier Trump set up a two-week deadline to decide whether or not to intervene in the ongoing political tensions between the two countries, after Iranian officials warned that America's involvement 'would be a recipe for an all-out war in the region'.

According to new reports, however, days prior to Trump's latest strikes, representatives from Iran threatened to unleash sleeper-cell terror in America if the US joined conflict in the Middle East.

Trump bombed three Iranian nuclear sites (Andrew Harnik/Getty Image)

Sleeper agents are spies and terrorists hiding in the US, living quiet and unassuming lives until they're ordered to act by officials from their governments, as per The Independent.

These individuals may be 'activated' by Iranian officials in the coming weeks, reports say, in response to Trump's latest bombing.

According to a memo sent by Rodney Scott of the US' Customs and Border Protection (obtained by NewsNation), 'thousands of Iranian nationals have been documented entering the United States illegally'.

The memo added that 'countless more were likely in the known and unknown got-a-ways'.

The federal agent continued: "Though we have not received any specific credible threats to share with you all currently, the threat of sleeper cells or sympathisers acting on their own, or at the behest of Iran has never been higher."

NBC claims the Republican leader caught wind of the sleeper-cell threat through an intermediary at the G7 Summit meetings that took place in Canada last week, which Trump left early amid increasing tensions between Iran and Israel.

Trump reportedly responded to a sleeper cell terror threat (Aaron Schwartz/Bloomberg via Getty Images)

Sources, including two US officials and an individual with knowledge of said threat, leaked the news to press today.

Following the attack, Trump vowed on Truth Social that any retaliation from Iran 'WILL BE MET WITH FORCE FAR GREATER THAN WHAT WAS WITNESSED TONIGHT'.

That said, however, law enforcement agencies in key cities are said to be on high alert for any terror-related response from the Middle East.

In a statement released by the Department of Homeland Security, officials claimed the 'Iran conflict is causing a heightened threat environment in the United States'.

A spokesperson for the department added that the chances of a potential terror attacks in the States is at an all time high, especially given that 'Iranian leadership issued a religious ruling calling for retaliatory violence against targets in the Homeland'.

The statement also addressed the possibility of cyberattacks being launched against US networks, with current and former government officials - many of whom Tehran blame for the 2020 killing of Iranian general, Qasem Soleimani - the most likely targets.