It's time for the United States to hold Iran accountable.

Hundreds of thousands of Iranians rallied on Friday to swear allegiance to the clerical establishment following U.S. President Donald Trump's warning that he had put the Islamic Republic "on notice", state TV reported.

On the anniversary of Iran's 1979 Islamic Revolution, which toppled the U.S.-backed shah, marchers including hundreds of military personnel and policemen headed towards Tehran's Azadi (Freedom) Square.

They carried "Death to America" banners and effigies of Trump, while a military police band played traditional Iranian revolutionary songs.

State TV showed footage of people stepping on Trump's picture in a central Tehran street. Marchers carried the Iranian flag and banners saying: "Thanks Mr. Trump for showing the real face of America."

"America and Trump cannot do a damn thing. We are ready to sacrifice our lives for our leader", a young Iranian man told state TV in a reference to Supreme Leader Ayatollah Ali Khamenei.

Last week, Trump put Iran "on notice" in reaction to a Jan. 29 Iranian missile test and imposed fresh sanctions on individuals and entities. Iran said it will not halt its missile program.

Iranian leading religious and political figures, including Pragmatist President Hassan Rouhani had called on Iranians to join the rally on Friday to "show their unbreakable ties with the Supreme Leader and the Islamic Republic".

In a speech marking the revolution's anniversary, Rouhani urged Iran's faction-ridden elite to seek unity amid increased tensions with the United States.

"Some inexperienced figures in the region and America are threatening Iran ... They should know that the language of threats has never worked with Iran," Rouhani told the crowd at Azadi Square.

"Our nation is vigilant and will make those threatening Iran regret it ... They should learn to respect Iran and Iranians ... We will strongly confront any war-mongering policies."

The rallies were rife with anti-U.S. and anti-Israeli sentiment. Some carried pictures of Trump, Israeli Prime Minister Benjamin Netanyahu and British Prime Minister Theresa May captioned "Death to the Devil Triangle".

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