Iran "will raze Tel Aviv and Haifa" to the ground if Washington attacks the Islamic Republic, a commander for its Islamic Revolutionary Guard Corps (IRGC) said earlier Monday to mass crowds celebrating the 40th anniversary of the Islamic revolution, according to Russian news channel Sputnik.
Soldiers, students, clerics and black-clad women holding small children flocked to the streets of cities and towns, many carrying portraits of Khomeini and Iran's current supreme leader, Ayatollah Ali Khamenei.
Last year, Iran cracked down on protests over poor living standards.
Prices of basic foodstuffs have soared since President Donald Trump withdrew Washington from the 2015 nuclear deal in May 2019.
But despite the official festivities today´s Islamic republic faces acute economic challenges as it struggles with a mix of domestic hardships and United States sanctions. But he remained defiant as Iranians recalled the end of a monarch who catered to the rich and unleashed secret police on dissenters.
In his address on Tehran's Azadi Square, Rohani said the "enemy will never reach its evil objectives", vowing that Iran will defeat US sanctions.
Trump´s chief foreign policy adviser said on Monday the Islamic revolution inflicted four decades of "failure and broken promises" on the country.
The large turnout in state-sponsored rallies, in which USA and Israeli flags were burned, came as Iranians face mounting economic hardships which many blame on the country's clerical leaders.
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Marchers carried cardboard cutouts of dogs.
Israeli television reported last week that Israel has discovered a new ambitious precision missile factory being constructed by Iran in Syria together with the Syrian government and Lebanese terror group Hezbollah, after Israel bombed and destroyed a previous one.
State TV showed a cartoon of the Shah being thrown into the "dustbin of history", wearing clothes in USA colours and holding Iranian newspapers headlined "The Shah has left!"
Iran and Saudi Arabia are locked in proxy wars in Iraq, Yemen and Syria.
"The world saw when Iran chose to help people of Syria, Iraq, Lebanon, Palestine and Yemen, they achieved victory".
"The presence of people in this celebration means that plots by the enemies ... have been defused", Rouhani said.
Following reports of a second failed space launch by Iran in less than a month, the U.S. State Department last week called for "tougher worldwide restrictions to deter Iran's missile program". -Gen. Hossein Salami, deputy head of Iran's Revolutionary Guards. "We will help any Muslim anywhere in the world".
Iran displayed its ballistic missile capabilities during Tehran rally, parading two missiles capable of reaching up to 800 kilometres.