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

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

Other approaches taken by schools included rewriting their rules to ban encampments and moving final exams to new locations.

USC announced the cancellation of the May 10 ceremony a day after more than 90 protesters were arrested on campus. The university said it will still host dozens of commencement events, including all the traditional individual school commencement ceremonies, during which students cross a stage and receive their diplomas.

Tensions were already high after the university canceled a planned commencement speech by the school’s pro-Palestinian valedictorian, citing safety concerns.

At Emerson College in Boston, 108 people were arrested overnight at an alleyway encampment. And new encampments and protests continued to pop up at campuses across the country.

Students protesting the war are demanding schools cut financial ties to Israel and divest from companies enabling the conflict.

Some Jewish students say the protests have veered into antisemitism and made them afraid to set foot on campus.