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And this is cnn this is cnn Breaking NewsBreaking News out of New York City, the nypd says Columbia University property has now been cleared hundreds of officers on columbias campus tonight, after the university asked them to clear out a propalestinian protesters who had set up an encampment and taken over a building just last night, dozens of people have already been arrested, ziptied, and loaded onto buses Columbia University of putting out a statement reading in part quo, we believe the group that broke into and occupied the building is led by individuals who are not affiliated with the university. The decision to reach out to the nypd was in response to the actions of the protesters, not the cause. They are championing lets use Day Protesters chose to escalate to an alarming an untenable situation including the vandalizing property, breaking doors and windows, blockading, entrances, and forcing our facilities and Public Safety workers out that columbia tonight is asking the nypd to maintain a presence on campus until at least may 17. I want to bring in cnn Shimon Prokupecz. Shimon. What are you seeing right now . And tell me how did all of this go down . Well, it was so significant and the presence was just so enormous early in the night, we started seeing the arrival of the search teams from the ny pd just Strategic Response teams. And thats when you really knew something was about to go down here. And it was just stunning to see the amount of officers that started just descending on the campus on to the area around the campus. And there were you hundreds of officers that started moving in and then more units started moving in. And then really the most serious action and some of the most heavily armed, some of the most tactical officers from the nypd started arriving here on the Amsterdam Side of the campus outside of Hamilton Hall to enter the building. Its clear that they had been planning for this since probably early this morning when things took a significant turn after several of the protesters stormed Hamilton Hall, got inside the nypd, you must feel you get a sense of that the entire day was spent planning this just when you look at the enormous response. And so the Emergency Services officers responded here and then we saw that heavily armed vehicle. Whats called a bear cat. And they went up against Hamilton Hall, going inside dozens of officers climbing up on the truck. And what going through the window into Hamilton Hall where they went room by room, clearing the hall, clearing the area making several arrests clearing the campus. They actually let some of the people on the canvas. They told him to leave some voluntary, voluntarily left dozens of others were arrested and just a short time ago it all just came to an end that many of those officers who went in with their tools, we saw things that would be used to cut through locks. We saw other things to break through doors. We saw other heavily armed equipment and shields and all those dozens of those officers streamed out, gotten their vehicles, and simply left. And now it would appear that the entire campus has been cleared. The hall has been cleared. We have no reports of any injuries. Laura but you know, ive covered many protests here in New York City. I have never seen a response like this, a mobilization like this, the way the nypd came in with such force, which such precision, and its clear in what in part this was to send a message. And part to protect themselves, something very significant happened here. It seems that they probably got some information. Theyve got very concerned they said that this was now a Safety Concern and they had to take this extreme measure and essentially come on campus, use the tactics that they did to get inside Hamilton Hall. So significant. I mean, this is a university, right . This is Columbia University. Scenes like this this is something thats going to be part of a history certainly for the city, for this university. And laura for the nypd, me is so significant. What they did here and how they did it and luckily right now as far as we know, there have been no injuries shimon just thinking about the presence that we saw the number of officers, it seemed as though there was at least just looking at you dont see many students, you see an overwhelming presence of Law Enforcement officials, as you mentioned, the tactical teams that were involved there. What were you hearing as they went into these buildings . Hamilton hall, specifically where you hearing people react, was there a presence on campus of students reacting to this overwhelming presence . What were you seeing on the ground in terms of seeing that presence from the community yeah. There were some of the students. Theres a bridge here just over my Left Shoulder some of the students were gathered up there. There were students behind this there actually screaming at the officers, shame, shame. Saying, you know, sort of calling them out for what they were, for what they were doing. Many of the people here dont agree with this. Look many of the faculty members many of the students dont agree with the nypd having the nypd come in on the campus, it was about a week and a half ago when columbia first did this and when they did that, when they did when they asked the nypd to come on campus and clear the encampment of first time. Its very significant. And there was a lot of backlash on the university from the faculty and the students. This escalation. Why are you calling the nypd and for days we heard from the university they didnt want to call the nypd. And again but after what happened this morning, it really left a university would no choice. And in talking to a sources at the nypd, laura, look, the nypd wanted to end this. They were very concerned that this was going to escalate and it was going to get to a point where there was going to be something very serious happening here. And so they felt the need they needed to go in tonight and it was really up to Columbia University. And finally, the university agreed to allow them to come in to go through those windows here at Hamilton Hall historic go through those windows, get inside that building and clear it shimon, please stay on this. Were relying on you so much. Thank you so much. I want to bring in cnns Miguel Marquez miguel, you are out with more protesters in the streets. We see a lot of people and still it what were looking at earlier tonight, images of officers on the campus of the area being cleared out the sheer presence and volume esha has articulated the number of officers that are there. What are you seeing now were seeing two more people being arrested. Thats what youre looking at right now. Those were people that were not on the columbia campus, but were just outside on show you where we are worth one 13. And amsterdam can, if you come down this way, this way, canvas way, we can theres still a large number for of Students Protesters who have gathered here outside the area of the police have closed off Hamilton Hall is just up the way here. A couple of blocks amsterdam Avenue Police made entry through the second floor of Hamilton Hall. They use flash bangs to distract whoever was in there. The doors were barricaded with tables and chairs and Soda Machines. There werent many people in there. And at this point, police say its done nobody that theres nobody on the columbia campus that shouldnt be there right now, which are essential workers and students who are living on the campus want to show you sort of the Police Presence up here at 114th street, hundred and 14 is where the police went in in massive numbers as shimon was saying i mean, im covered stuff like this All Over The World had never seen this big a Police Presence and if theyve handled it very quickly, i think we thought wed be here for many more hours, but police now say its completely done. The only thing left in there in encampment are the tenths and their personal possessions but you can see the number of Police Officers who have moved here 214th street has 14th is where the police went into the campus and then they brought out most vls. Hes got 140. Theres still one bus down there and as police go in and out, so theyre taking these two that were just arrested down to the bus that is down here that will the remainder of the arrestees that were in colombia, these people will now join them on that bus because you can see the number of Police Officers that are protecting this area. And then protesters across the street here as well, who are shouting at Police Relations . Yeah. Go ahead. Where are you in relation to Hamilton Hall . I mean, in terms of where where officers were . So i was just explaining so hamiltons hold down the street here and streeter. This is one 16. So two blocks up basically is where Hamilton Hall hello right next to us. If you can see these people hanging out the windows here, thats also thats part of Columbia University. Thats john j. Hall, which is just down just down from Hamilton Hall all and people are actually hanging out just watching whats happening on the street. These are people who live in the dorms here at the university and theyre able to sort of just hand out on the window sills some selves, and watch everything going on. But it it while while it is done on the inside, its certainly not done on the outside. Just a short time ago here at onethirteenth protesters are gathering their, their, their billing at police and they police are still trying to control a situation outside of campus. You can see all the people across amsterdam avenue. They have set up any enormous cordon around the university here broadway is shut down both directions from one 20th, amsterdams also shut down. So both sides, both avenues along both sides of the university are completely shut down all the side streets. One, 1516, theyre all shut down as well and then they have barricades. Theyve been moving barricades and we knew something was going on because we saw these trucks early and late in the afternoon with tons of barricades coming in. So it was very clear that that Something Different was happening than wed seen seen in previous days. But right now, police say Columbia University itself is done and theres nobody on on the grounds that shouldnt be there. There were no injuries. They said no resisting, no reports of resisting arrest but the area around Columbia Police are still dealing with laura. Let me just how significant people april who may or may not be familiar with the new york area to shut down areas of broadway and amsterdam and beyond the surrounding area. This is extremely coordinated, insignificant, and what have taken a great deal of planning and to have that same level of Police Presence at this very hour. Emacs the campus has been cleared as they say, very significant, miguel, please stay with us. I want to bring it in reporter julia vargas jones, juliet, you were actually on campus and police first entered the school. Weve been watching you throughout the day and weve seen the ebb and flow officers and now the maintenance of their presence there. What are you seeing right here even moving allowed back on campus or what campus luck flight but i want to move our f4 over. Just want to make sure explain where julia, were having problems hearing you quite well. Again, were watching the giulia as youre walking in, you that you have an s squared. So get you back on campus. You have been allowed your moved away from the police buses at this point, but i want to build can we hear you again . Youre walking on because it campus where add a little trouble hearing you talk again to me. Where on campus were gonna youre gonna fix it and come hold on, deliberate. Its too important to lose what youre saying. Were going to bring in cnn chief Law EnforcementIntelligence Analyst john miller. We will come back to you as well. I want to know whats happening on the campus now that police have been cleared, john youve been watching all of this. And as we heard from miguel at one point and talk about Distraction Devices being used in Hamilton Hall tonight. What are those . So a Distraction Device is one of those things that looks like a can. You throw it . It goes flash and then bang, which is why they call it a flash bang and it basically, if somebody is waiting for you on the other side of it, that means you harm it is disorienting just for a few seconds to the person on the other side and allows police to gain control. So when they did their entry today, not knowing what was going to be waiting for them on the other side, they threw these devices into disorient anybody who might be waiting for them with ill intent as it was laura, their search of the building turned up relatively few people but they had to go floor by floor doing that search. What many people are talking about no. But i mean, i spoke to the people who were in the building and they said, we havent run into a whole lot of people since weve been doing the floor by floor i think what you saw their laura was they knew a couple of things going in. They knew one for certain, there was going to be no element of surprise. It was in social media, it was on the news that police had been authorized by in writing by the university to retake the building i think the considerations that were built into their plans were to bring an overwhelming number of Police Officers to be able to show that overwhelming number to whatever number of people they confronted outside and then inside that building which was unknown to minimize the use of force that they would have to use. And as we see they made a number of arrests still trying to get that number the last we heard from police, it was 50 and counting. But we dont ever get that number. You think im obviously we believe doesnt have been arrested to your point, but theres not an official account that has been provided yet from the nypd. Is fact theyre gonna go through the Booking Process and also Shimon Prokupecz was saying earlier that they were allowing some people to just leave the area. Now they dont mean those who were inside Hamilton Hall, right . Those people around the area, people who were in Hamilton Hall . All were they all arrested . It seems so. Again, unknown people inside Hamilton Hall, although we do know that it was a very small number. So i think what we saw is that once word got out that they were going to retake the building, the people in Hamilton Hall may have left to join the group outside. That would be a less serious charge. It would likely not include burglary or certain criminal Trespassing Statutes if they werent inside, if they were a student it would be something even less because its hard to charge a student who is entitled to be on campus with one of those things. So that may be what we saw, but what they got was they got the warning, which is if you dont move away from the front of this building, yeah. Youre going to be arrested. They were given time to comply with that warning and let me go inside the building, john, because actually i can say with me, okay, im getting some new footage of what took place, when nypd went inside of Hamilton Hall and they of course found that there were barricaded doors with chairs. Weve heard about Soda Machines and beyond. As you can see, the footage right now, java, were actually watching officers with shield. We nypd emergency unit. They have a hammer and a sledgehammer trying to break into areas that appear to have libraries inside. Obviously theres a campuses in an Academic Office theyre going up the stairs are passing down chairs. It seemed to have been areas of barricading as well. I mean, what im seeing right now is tactical gear, helmets and she fields and zip ties. And im assuming that they would also have weapons on them because they would not necessarily know the level of resistance or if it was armed resist