New York — Tension gripped college campuses across the United States Tuesday morning as Jewish students marked the Passover holiday amid disturbing allegations of antisemitism at pro-Palestinian protests. The demonstrations have ramped up in recent days as Israel's devastating war against Hamas grinds on in the Gaza Strip, where the Hamas-run Health Ministry says more than 34,000 people have been killed, most of them women and children. In New York, Columbia University's president cancelled in-person classes Monday in response to the protests and said classes would be hybrid through the end of the semester. With Passover beginning, the school said...