The University of Southern California canceled its main graduation ceremony Thursday and dozens more college students were arrested at other campuses nationwide as protests against the Israel-Hamas war continued to spread.

College officials across the U.S. are worried the ongoing protests could disrupt plans for commencement ceremonies next month. Some universities called in police to break up the demonstrations, resulting in ugly scuffles and arrests nationwide, while others appeared content to wait out student protests as the final days of the semester ticked down.

Schools such as Columbia University continued to negotiate with protesters, while others are rewriting their rules to ban encampments and moving final exams to new locations.

But encampments and protests continued to spring up Thursday. A tent encampment popped up at Indiana University Bloomington before police with shields and batons shoved into a line of protesters, arresting an unknown number.