Open this photo in gallery: Police pepper spray pro-Palestinian protesters blocking police vehicles from leaving the University of Texas in Austin, Texas, Monday, April 29, 2024.Aaron E. Martinez/The Associated Press Dozens of protesters took over a building at Columbia University in New York early Tuesday, barricading the entrances and unfurling a Palestinian flag out of a window in the latest escalation of demonstrations against the Israel-Hamas war that have spread to college campuses nationwide. Video footage showed protesters on Columbia’s Manhattan campus locking arms in front of Hamilton Hall early Tuesday and carrying furniture and metal barricades to the building,...