Tehran on Sunday threatened to retaliate against Israel and United States bases in the event of US strikes on Iran, delivering the warning to Washington as Israeli sources said Israel was on high alert for the possibility of any US intervention.

With Iran’s clerical establishment facing the biggest anti-government protests since 2022, US President Donald Trump has repeatedly threatened to intervene in recent days, warning Iranian leaders against using force against demonstrators. On Saturday, Trump said the US stands ready to help.

Iranian Parliament Speaker Mohammad Baqer Qalibaf, speaking in parliament on Sunday, warned the US against “a miscalculation”.

“Let us be clear: in the case of an attack on Iran, the occupied territories (Israel) as well as all US bases and ships will be our legitimate target, said Qalibaf, a former commander in Iran’s Revolutionary Guards.

Three Israeli sources, who were present for Israeli security consultations over the weekend, said Israel was on a high alert footing, but did not elaborate on what that meant.

An Israeli government spokesperson declined to comment. The Israeli military didn’t immediately respond to a request for comment.

Israel and Iran fought a 12-day war in June, in which the US joined Israel in launching airstrikes. Iran retaliated for those US strikes by firing missiles at an American air base in Qatar.

Death toll increases

Protests have spread across Iran since December 28, beginning in response to soaring inflation, and quickly turning political with protesters demanding an end to clerical rule. Authorities accuse the US and Israel of fomenting unrest.

The flow of information from Iran has been hampered by an internet blackout imposed by the authorities since Thursday.

A US-based rights group, HRANA, said the death toll had climbed to 116, mostly protesters but including 37 members of the security forces.

Iranian state TV broadcast funeral processions in western Iranian cities like Gachsaran and Yasuj for security forces killed in protests.

A social media video posted on Saturday showed large crowds gathered in Tehran’s Punak neighbourhood at nighttime, drumming rhythmically on a bridge or other metal objects in an apparent sign of protest. Reuters verified the location.

Iran’s rulers have quelled repeated bouts of unrest, most recently in 2022 over the death in custody of a woman accused of violating dress codes.