Desperate Iranian mullahs could lash out at America ordering deadly cyber attacks on our dams and electricity grids – or even terror attacks from 'sleeper cells', security experts are warning.

DailyMail.com spoke to former top diplomats, cybersecurity and national security experts who said that although the Iranian regime is on the back foot and reeling from Israeli bombardment, it still has the ability to wreak havoc on US soil.

A former senior diplomat who had extensive Top Secret security briefings on Iran told DailyMail.com that the new 'hot war' between Iran and Israel, and Ayatollah Khameini's increasingly desperate position, has ratcheted up the risk of the regime taking drastic action in the US.

'I can't imagine, seeing how this war is going, that Iran is going to hold back,' said the top ex-US official, who spoke on condition of anonymity.

'They're running out of options, and this is one of the areas in which they've unfortunately been quite effective.