Video posted on social media appears to show a crowd dispersing and shouting on a street outside Sharif University. In the clip, several people standing on an overpass overlooking the scene yelled insults towards police officers below, while the sound of what appears to be gunfire can be heard in the distance.

Another video posted from the same account appears to show security forces chasing dozens of students in the university’s underground car park. The account said dozens of students had been arrested.

Iranian security forces confronted students at the university, state media reported, in the latest sign of a deadly clampdown on nationwide protests that were ignited by the death in custody of 22-year-old Mahsa Amini.