We can show you the moment when Police Officers begin to enter Hamilton Hall that is an Academic Building that was occupied in the early hours of tuesday. Nypd officers in riot gear entered the building through a window. Several officers used a ladder to reach an upper floor, crawling through the opening to enter the hall. The protesting students had smashed their way into that building to gain access and had barricaded themselves inside. Meanwhile, those who were detained were moved to police buses you can see here. Students were led off campus with their hands behind their backs. New york police said that no tear gas was used. In a letter to the new york police department, Columbia University said, we believe that while the group who broke into the building includes students, it is led by individuals who are not affiliated with the university. The university had requested help by local police to clear the scene. Just to remind you of the events that led up to this Police Operation an