Iranian students defied warnings from the feared Revolutionary Guards and Basij militia that nationwide protests must end by Sunday, prompting a fierce response from riot police and militia, videos on social media showed.

Iranians from all walks of life have been protesting since the death of 22-year-old Mahsa Amini in the custody of the morality police after she was arrested for attire deemed inappropriate.

Iran’s Revolutionary Guards top commander warned protesters that Saturday would be their last day of taking to the streets, the harshest warning yet by Iranian authorities.

Nevertheless, videos on social media, unverifiable by Reuters, showed confrontations between students and riot police and Basij forces in universities all over Iran.

Security forces tried to block students inside university buildings, firing tear gas and in some cases beating protesters with sticks, while the students pushed back, with some chanting “dishonoured Basij get lost” and “Death to Khamenei”.

The Guards and its affiliated Basij force have crushed dissent in the past. They said on Sunday, “seditionists” were insulting them at universities and in the streets, and warned they may use more force if the anti-government unrest continued.

“So far, Basijis have shown restraint and they have been patient,” the head of the Revolutionary Guards in the Khorasan Junubi province, Brigadier General Mohammadreza Mahdavi, was quoted as saying by the state news agency IRNA. “But it will get out of our control if the situation continues.”

HENGAW, an independent organisation that covers human rights violations in Iran’s Kurdistan, where Amini was from, said security forces opened fire at female students in a university at Sanandaj city.

More than 300 Iranian journalists demanded the release of two colleagues jailed for their coverage of Amini in a statement published by the Iranian Etemad and other newspapers on Sunday.

Niloofar Hamedi took a photo of Amini’s parents hugging each other in a Tehran hospital where their daughter was lying in a coma.

Elaheh Mohammadi covered Amini’s funeral in her Kurdish hometown Saqez, where the protests began.

A statement released by Iran’s intelligence ministry and the intelligence organisation of the Revolutionary Guards on Friday had accused Hamedi and Mohammadi of being CIA foreign agents.

The arrests match an official narrative that Iran’s arch-enemy the United States, Israel and other western powers and their local agents are behind the unrest and are determined to destabilise the country.

At least 40 journalists have been detained in the past six weeks, according to rights groups, and the number is growing.

Students and women have played a prominent role in the unrest, burning their veils as crowds call for the fall of the Islamic Republic, which came to power in 1979.

An official said on Sunday the establishment had no plan to retreat from compulsory veiling but should be “wise” about enforcement.

“Removing the veil is against our law and this headquarters will not retreat from its position,” Ali Khanmohammadi, the spokesman for Iran’s headquarters for “Promoting Virtue and Preventing Vice” told the Khabaronline website.

“However, our actions should be wise to avoid giving enemies a pretext to use it against us.”

The apparent hint at compromise is unlikely to appease the protesters, most of whose demands have moved beyond dress code changes to calls for an end to clerical rule.

In a further apparent bid to defuse the situation, Parliament Speaker Mohammad Baqer Qalibaf said people were right to call for change and their demands would be met if they distanced themselves from the “rioters” taking to the streets.

“We consider the protests to be not only correct and the cause of progress, but we also believe that these social movements will change policies and decisions, provided that they are separated from violent people, criminals and separatists,” he said, using terms officials typically use for the protesters.