Sri Lanka, April 26 -- The University of Southern California canceled its main graduation ceremony and dozens more college students were arrested at other campuses nationwide Thursday 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 have called in police to break up the demonstrations, resulting in ugly scuffles and hundreds of arrests, while others appeared content to wait out student protests as the final days of the semester ticked down.

Schools such as Columbia University in New York continued to negotiate with protesters who first set up an encampment last week. At California ...