A message from their Facebook solidarity group (Click the link and send your damn solidarity, already!):

The cops went in at one of the gates of the UPR Rio Piedras campus and bashed heads. Around 30 wounded, including a reporter. They’ve retreated. No real reason stated, and the “officers” had no badges on display. A line of professors later stepped in between the cops and the students. According to the Non-confrontation Policy that both parties (students/protesters and the State) have followed for years, police are not supposed to enter the UPR. Of course, with this reactionary government we’ve seen that nothing is respected.