Protests in Iran over the death of Mahsa Amini, a 22-year-old Kurdish woman who died in police custody, continue to unfold across the country. Despite attempts by Ebrahim Raisi’s government to suppress the uprising and restrict the flow of information, footage emerging from the country has shed light on the movement and the regime’s violent crackdown. As the protests enter their fourth week, the Guardian’s Emma Graham-Harrison explains what the latest footage coming out of Iran tells us about the country