A wave of anti-government protests in Iran entered its fourth week and showed no signs of slowing Monday, despite hundreds of protester deaths and reports of police raiding schools in unmarked vans and dragging students away.

Footage circulating on social media showed protests across the country on Sunday, with young schoolgirls and university students braving tear gas, batons, and live ammunition to vent their rage against the theocratic government and its edicts requiring women to wear headscarves, or hijabs, and other restrictions on women’s rights. Many of the women have been shown hacking off their hair and  burning their headscarves in the street.

The protests, started primarily by young women, have spread to other sectors of the society and mark the biggest threat to the clerics who control the country since 2009.

A handful of employees in the country’s critical oil and gas industry joined the students and walked off the job Monday, according to the Associated Press. Online videos showed dozens of people at the Asaluyeh refinery on the coast south of Tehran, some with their faces covered, chanting “shameless” and “death to the dictator,” both rallying cries used by the student protesters as well.

The protests were sparked by the death of 22-year-old Mahsa Amini while in the custody of the country’s so-called Morality Police. The young Kurdish woman was arrested because too much of her hair was showing from beneath her hijab during a visit to Tehran. The government denies that Amini was mistreated, but her family said her body showed signs of bruising and other evidence of abuse.

Iranian authorities have responded to the uprising with brutal crackdowns on street protestors and widespread arrests of both public figures and ordinary Iranians. The New York-based Center for Human Rights in Iran believes that at least 1,200 people have been arrested so far, including prominent athletes such as soccer player Hossein Mahini, journalists, lawyers, and artists.

An Iranian activist group based in Norway, Iran Human Rights, tallied at least 185 deaths across the country as a result of the crackdown. Protesters have been killed in 17 provinces, with the worst numbers coming out of Sistan and Baluchistan. The group cautioned that efforts to confirm its body count have been hampered by security issues and a virtual shutdown of the internet across the country.

Saturday night, activists managed to hack one of the primary news programs on Iran’s state-run television and superimpose a 10-second clip that showed Iran’s supreme leader, Ali Khamenei, in crosshairs along with pictures of some of the martyred women and the phrase, “the blood of our youths is on your hands.”

The group responsible, which calls itself Edalat-e Ali, or Ali’s Justice, also displayed its Twitter, Instagram, and Telegram channels on the screen during the interruption. Because of government lockdowns, much of what the world knows about the goings-on in Iran has been via videos circulated online and on social media.

On Monday, the United Kingdom joined the United States and other countries in issuing new sanctions against the Iranian regime, including the head of the country’s Morality Police, Mohammed Rostami Cheshmeh Gachi, and of its Tehran division, Haj Ahmed Mirzaei.

The sanctions also target other leading security officials, including the head of the Revolutionary Guard’s Basij force, and two commanders in the Iranian police. Those sanctioned will not be allowed to travel to the U.K., and any assets they hold in the country will be frozen.

“These sanctions send a clear message to the Iranian authorities — we will hold you to account for your repression of women and girls and for the shocking violence you have inflicted on your own people,” the U.K.’s foreign secretary, James Cleverly, said.