At least 10 people have been killed during protests that have spread across Iran, including two members of the country's Basij paramilitary force.
Tension was growing as authorities warned demonstrators they would not allow economic grievances to spiral into unrest.
The deaths were reported in several western provinces, where clashes between protesters and security forces have been most intense, state media and human rights groups said.
The demonstrations, sparked by soaring inflation, a plunging currency and rising living costs, are smaller than previous waves of unrest but have spread nationwide, including to Tehran.
On Friday, Iranβs police issued a warning, saying the force would support lawful protests but respond firmly to violence. βWe will not allow civil protests to be turned into insecurity and chaos,β police spokesman Brigadier General Saeed Montazerolmahdi was quoted by state media as saying.
He added that recent gatherings were βentirely economic and civilβ in nature, driven by demands for improved living conditions, but accused βforeign-guided elementsβ of attempting to hijack demonstrations.
Iranβs security and intelligence agencies said they had detained several people accused of "links to foreign-based opposition groups" and of trying to incite unrest under the cover of protests.
President Masoud Pezeshkian on Thursday pledged to crack down on corruption and rent-seeking, while urging restraint and national unity. His remarks struck a more conciliatory tone than that adopted by his predecessors during previous waves of unrest.
People walk next to an anti-US mural on a street in Tehran. Reuters
The situation took on an international dimension after US President Donald Trump threatened intervention if Iranian authorities violently suppressed protesters. βIf Iran shoots and violently kills peaceful protesters, which is their custom, the United States of America will come to their rescue,β he wrote on social media.
Iranian officials swiftly cited the remarks as evidence of foreign interference. Parliament Speaker Mohammad Bagher Ghalibaf warned that any US action would provoke retaliation. βAll American bases and forces in the entire region will be our legitimate target in response to any potential adventure,β he said.
The unrest began on Sunday when shopkeepers in Tehran closed their businesses in protest against the sharp fall of the rial. Students later joined demonstrations at around 10 universities, including several in the capital.
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