Iranian authorities have barely mentioned days of demonstrations in the major cities of Isfahan, Shiraz, Mashhad and Tehran, driven by concerns over the economy as well as wider anger at the political system.
Three months ago, the U.S. withdrew from a 2015 agreement among world powers and Iran in which worldwide sanctions against Tehran were lifted. "The judiciary should find these people and arrest them", the cleric says, to chants of "Allahu akbar" ("God is greater") from the crowd.
Iran will not sit down for negotiations under pressures, in particular with U.S. President Donald Trump who "has breached obligations", Iran's Foreign Ministry Bahram Qasemi said Saturday.
Sporadic protests were taking place in cities in Iran for a fourth day, with demonstrators attacking a Shi'ite seminary west of Tehran, according to Iranian news agencies and social media on Saturday, as Iranians brace for a return of United States sanctions.
The Trump administration argued that the nuclear deal, which lifted some economic sanctions in exchange for restrictions on Tehran's nuclear program, was fatally flawed because it didn't address the country's destabilizing behavior or limit its development of ballistic missiles, among other things.
From Iran, it said it would block off the Strait of Hormuz if it's isolated from the global oil market.
Washington chose to reimpose sanctions on Iran upon its withdrawal, accusing it of posing a security threat, and has told countries they must halt all imports of Iranian oil from November 4 or face USA financial measures.
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As part of the withdrawal, the USA will on Monday begin to sanction Iranian transactions with US dollar banknotes; trade in gold and precious metals; direct or indirect sales of graphite, raw or semi-finished metals; and Iran's automotive sector.
Iran Air announced it would take delivery of five ATR aircraft from the French-Italian firm on Sunday, sneaking under the wire before the sanctions return.
Although smaller foreign firms have vowed to work around the United States measures, multinationals such as France's Total and Peugeot, and Germany's Siemens have already said they will have to pull out.
US Secretary of State Mike Pompeo said last month his country was open to consider waivers for certain buyers of Iranian oil.
Iran has started naval exercises in the Gulf amid heightened tensions with Washington, US officials have revealed.
"We are already seeing vehicle prices going through the roof over fears about raw material imports", she told AFP.