Protesters regroup at Columbia, garnering support from students at other colleges. Penn blocks a pro-Palestinian group; USC cancels more graduation speakers. Campus unrest stemming from the Israel-Hamas war ratcheted up over the weekend, following last week’s Congressional testimony on antisemitism by Columbia University’s leaders and the arrest of more than 100 pro-Palestinian protesters on the university’s New York campus. But the tensions spread far beyond Morningside Heights, gripping campuses around the country. A roundup of the latest developments: