A New York City police officer walks past seating that was to be used for a large graduation ceremony at Columbia University in New York, Monday, May 6, 2024. (AP Photo/Seth Wenig) NEW YORK — Columbia University says it has expelled or suspended some students who took over a campus building during pro-Palestinian protests last spring, and had temporarily revoked the diplomas of some students who have since graduated. In a campus-wide email sent Thursday, the university said its judicial board had issued its sanctions against dozens of students who occupied Hamilton Hall based on its “evaluation of the severity...