New footage captures what occurred when NYPD entered Hamilton Hall on Columbia University's campus. John Miller breaks down how the NYPD kept resistance minimal.
CNN's Shimon Prokupecz breaks down the NYPD's response at Columbia University, where police arrested dozens after the university requested their assistance to respond to on-campus protests.
Student protestors at Columbia University barricaded doors around the building on campus that they have been occupying. CNN's Julia Vargas Jones reports from the scene.