Using a tactical vehicle, New York City police enter an upper floor of Hamilton Hall on the Columbia University campus in New York Tuesday, April 30, 2024, after a building was taken over by protesters earlier Tuesday. Hundreds of police officers swept into Columbia University on Tuesday night to end a pro-Palestinian occupation of an administration building and sweep away a protest encampment, acting after the school's president said there was no other way to ensure safety and restore order on campus. (AP Photo/Craig Ruttle)