There have been running battles between Iranian police and anti-government protesters in Tehran in the worst unrest there for years.
One person told BBC Persian that her neighbourhood resembled a battlefield.
The protests, now in their seventh day, have reached 80 other cities and towns. A human rights group said at least 31 civilians had been killed, while state television put the death toll at 17.
The unrest was sparked by the death of a woman detained by morality police.
Mahsa Amini, a 22-year-old Kurdish woman from the north-western city of Saqez, died in hospital in Tehran on Friday following three days in a coma.
She was visiting the capital on 13 September when she was arrested by morality police officers, who accused her of violating the law requiring women to cover their hair with a hijab, or headscarf, and their arms and legs with loose clothing. She collapsed after being taken to a detention centre.
There are reports that officers beat Ms Amini’s head with a baton and banged her head against one of their vehicles. The police have said there is no evidence of any mistreatment and that she suffered “sudden heart failure”.
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