Since the death of 22-year-old Kurdish woman mehsa Amini in the custody of the morality police last month , Iran has been witnessing protests that have turned into a popular revolution involving angry Iranians from all strata of society , posing one of the boldest challenges to clerical leaders since the 1979 revolution.

Rights groups have said at least 250 protesters have been killed and thousands arrested across Iran. Video footage circulated on social media on Friday showed protesters chanting the death of Supreme Leader Ayatollah Ali Khamenei and the Basij forces, which played a major role in suppressing the protesters.

The commander of the Iranian Revolutionary Guards, Hossein Salami, warned the demonstrators that Saturday would be the last day they would take to the streets. He said, " Don't take to the streets , today is the last day of the riots."

Iranian security forces have targeted a hospital and a student dormitory, a rights group said Saturday, coinciding with the entry into the seventh week of the protest movement sparked by the death of mehsa Amini.

Amini, a 22-year-old Iranian of Kurdish origin, died after being arrested in Tehran on charges of violating the strict dress code imposed on women in the Islamic Republic.

Security forces have struggled to control the women-led protests, which have morphed into a broader campaign to topple the regime of the Islamic republic, founded in 1979.

During a ceremony marking the 40th anniversary of the killing of a protester in the city of diwandeh on Saturday, protesters chanted "Death to the dictator," a slogan aimed at Supreme Leader Ayatollah Ali Khamenei.

According to the human rights organization "henkao", security forces fired at dozens of people who gathered outside the same hospital late on Friday in order to protect another protester who was injured.

"The repressive forces opened fire on people who had gathered in front of the Kawther hospital in Sanandaj to defend Ashkan marwati,"the Norway-based organization said.

The organization for human rights in Iran called for intensifying "diplomatic pressure" on Iran, while its director Mahmoud Amiri-Moghaddam warned of a "serious risk of mass killings of demonstrators, which the UN is obliged to prevent".

But there are no signs that the protests, sparked by Amini's death on September 16 and fueled by popular anger over the security crackdown that has killed many other young women and girls, are likely to subside.

In a joint statement, the Ministry of intelligence and the Revolutionary Guards accused the US Central Intelligence Agency (CIA), Britain, Israel and Saudi Arabia of"plotting" against the Islamic Republic by "provoking riots" in Iran.