Protests ignited by the death of a young woman in police custody continued across Iran on Sunday despite a fierce crackdown by the authorities, as a human rights group said at least 185 people, including children, had been killed in the unrest.

Demonstrations that began on September 17 at the funeral of 22-year-old Mahsa Amini in her Kurdish town of Saqez, have turned into the biggest challenges to Iran’s clerical leaders in years.

“At least 185 people, including at least 19 children, have been killed in the nationwide protests across Iran. The highest number of killings occurred in Sistan and Baluchistan province with half the recorded number,” said the Norway-based Iran Human Rights in a statement on Saturday.

Videos shared on social media showed protests continued in dozens of cities across Iran early on Sunday with hundreds of high school girls and university students joining in despite the use of tear gas, clubs, and in many cases live ammunition by the security forces, according to rights groups.