Remember, this is the site of where that active shooting was in 2013 that took the lives of 12 people. The huge response under scores the governments terror warnings ahead of this holiday weekend. Security has been stepped up. Also were told outside of the white house and also it is being extended for blocks. Lets go straight to jeff zeleny on the scene. Jeff . Reporter good morning, poppy. Youre right. It is still very much an active situation here as you can see. Were on m Street Southeast in washington, d. C. You can see behind me the navy yard is a couple blocks in the distance. The Police Presence is as high as it was more than an hour ago when we first arrived on seen. But theres no confirmation that there was a shooter inside. There were just reports of a shooter inside. You can see by the response here how on edge this city is and in fact how on edge the country is as we head into this holiday weekend. Weve talked to witnesses who were inside this episode this morning. They were told to leave. They were told if you the couldnt shetlter in place some for actually running out of the building. But again, no reports of anyone we could find who actually heard a gunshot. The Police Presence has not diminished at all over the last hour or so. Still investigating this. Still a very serious situation here in southeast washington. Jeff and of course everybody is very alert when you talk about place where such a tragic mass shooting happened two years ago. Stay with us on the scene, jeff. I do want to bring in pamela brown working her sources as always. Also Jonathan Gilliam as well. Pamela, lets talk about the 911 call. Weve learned through sources that someone placed a 911 call earlier this morning and said there was a shooting on the second floor of building 197, which as you meng edtioned is the same building where inging where 12 people were shot and killed two years ago. The building was evacuated. And we can tell you that mpd has been going room to room searching hallways, stairwells bathrooms. The second floor where the 911 11 shooting was called in. Were being told nothin found. No one has been arrested were told as of now. What theyre really wanting to do is talk to this person who made that call to see if there is really any validity to it. I think this response were seeing with all different Law Enforcement is reflective of the threats right now. Its significantly high ahead of the holiday weekend. Law enforcement doesnt want to take any chances whatsoever. The scene has not been cleared yet, so we cant jump to any conclusions yet. But so far nothing has been found. When you talk about the way security has potentially changed on the base since the 2013 shooting you said fbi is on scene, atf is on scene. Also do we know if security at this facility was stepped up since that tragic event in 2013 . I know right after the tragic eentd event there was take about that. What i can tell you today, though s that there were various Law Enforcement agencies that came together and activated the active shooter protocol. There are drills for this. So when this phone call was made that protocol was activated and we saw it play out right here. Its just amazing to see the response here from this 911 call that was made. Again, we havent been able to verify it but still an active situation. Jonathan to you. This is a historic facility, the Washington Navy yard. 16,000 employees work there. When you talk about them looking at building 197 where the 2013 shooting happened, what were being told is that they did not find anything in that building especially on the second floor. But now theyre scouring all of the surrounding buildings. This will take hours. Exactly. Everybody is still being told to lock down and shelter in place because when there is a possibility of an active shooter Law Enforcement is actively seeking that shooter. So things change after columbine to where Law Enforcement goes directly to the location where they think there may be a shooter. Doesnt matter what Law Enforcement it is. The first ones there go directly towards that and they try to eliminate that threat. That changed after columbine and we know why. So the issue that im having when i look at this picture is the overwhelming number of Law Enforcement that is there is telling me and it just looks as though theyre making this up again as we go along. That is not a coordinated scene right there. To be fair were seeing one shot. We dont have an aerial shot. We dont have multiple camera locations. Were looking at one shot. Is that something we can decipher from looking at this shot. I mean i can. I have experience to say this is just all hands get there. Im not going to go in and criticize them right now, but when theyre searching something this large in washington, d. C. , these agencies learned or should have learned from the last shooting that they had there that all the agencies need to coordinate. They needs to Work Together all the time. Thats what i would like to see. What im seeing there, though is everybody showing up. Its important right because this is an active scene. There doesnt have to be a shooter to be an active scene, though though. I want to go to evan perez. Evan what are your hearing . Reporter so far were only hearing theyre responding to this 911 call of a man with a gun. They still have not given any official word that there was actually any shooting. We talked to workers here just next to the navy yard theres a supermarket where a lot of workers have gathered. A lot of them are very frightened, but they all say they never heard any gunshots unlike the thirty shoot2013 shooting. Theres a heavy Police Presence here as you can see over my shoulder. There are some agencies that are pulling out. This appears to be contained. This is m street a very busy area. The last the time when we had this you had blocks and blocks that were cordened edcordonned off by the police. This is what a coordinated response is, actually. You have all hands on deck because you want to make sure that you secure this area. And thats the response you get. Evan what is the feeling youre getting on the ground there . It was just a few years ago, 2013 when that horrific incident broke out at 8 20 in the morning on september 16th. Reports of a 911 call started coming in right around a. M. 8 00 a. M. What is the feeling you get from Law Enforcement on the ground there . Reporter again, the 2013 shooting we had victims there. Victims who were shot and found on the street just a couple of blocks away from here. Again, we have groups and clusters of workers who have been organized clearly as in like a fire drill. Weve talked to them. Theyre all gathered here. They were at work. Some of them were on the navy yard grounds and got out. Some of them were just arriving to work. None of them report that they saw or heard any shooting. We know Law Enforcement is actively searching these buildings to make sure they declare them safe. Its going to take hours to do this. This is a very large facility. There are thousands of workers who work there. Also pamela brown brought up the fact that Law Enforcement is on heightened alert here across the 4th of july holiday because of the increasing threat to this nation. However, no specific plots have been uncovered. But do you believe that is part of what has driven this response this morning, such a big Immediate Response just given the heightened alert across the country right now . Reporter i think thats right. I think thats exactly what you expect. Because this facility again is an important naval facility its an important symbolic facility here in this city thats the reason why you have such a major response. Again i think the procedure of what im told by Law Enforcement is the procedure at the navy yard is when there is any kind of 911 call as they received today of a man with gauna gun, their procedure is to treat it as an active shooter incident. Thats what they do. They follow their procedure according to Law Enforcement officials ive talked to. And you point to tinhe increased threat level, i think that is actually definitely playing into this. I know that in different parts of the city just a few blocks up to the capitol, theyre on high alert as well. You can see more Police Presence simply because of this belief there could be something that would be in the work would be in the works for the next few days. I want to go to our tom fuentes to get some analysis, tom, former fbi assistant director, former Police Officer yourself. When calls like this come in, how do you decipher between reality and a hoax . Unfortunately they cant unless its just clearly obvious that the person calling is drunk or has some other problem. If it seems to be at all possibly credible they have to respond. And we over seen thisve seen this now with the airline hoaxes. One phone call brings a check of the entire plane. This phone call was called in almost two hours ago. And unfortunately they still havent determined completely that it appears to be a false alarm. But now they have to prove a negative and search every building, every room every closet on the entire complex to try to determine absolutely that its a false alarm and or a hoax. Thats the problem. They cant wait two or three hours later to figure it out if in fact there was an active shooter running around on that base. And again, tom, stay with me. Again to reset for our viewers here what we know at this point in time as that at the Washington Navy yard where there was that horrific shooting back in 2013 when 12 people were killed, there is now a shelter in place because of a 911 call that reported a shooting on the second floor of building 197, that same building where the 2013 shooting took place. However, however, there has been in siting we are told of any gunman whatsoever. And no one has said they have heard shots fired. We want to not be too alarmist here. Youre seeing all of this Police Response. But, again, no gunman identified. Now they are skaurcouring the 2. 2 million square feet of office space. I want to talk to him about internal security there. As i do let me read you this from the pentagon. Pentagon saying it has not raised its Security Posture at the pentagon in reaxzction to the situation at the navy yard but they are keeping a close eye on what is unfolding, that coming from a defense official to one of our producers there jamie crawford. Good morning. Secondly, tom fuentes has given some terrific input to this and great analysis. But personally i believe this is a bit of an over reaction. I see the streets clogged with a variety of different Law Enforcement characters. What i tell you, from the standpoint of a guy whos commanded Large Organizations and who has run posts like this im sure the Garrison Commander at the Washington Naval yard has done proper coordination with local police. He also has Security Forces on the base itself. So they probably have a good plan for when Something Like this goes down. I think its the environment were in right now thats causing the overreaction. Whats critical is this happens all the time at military bases. When i was commanding in europe i would get an average of three calls a week of either an active shooter or a bomb outside of a building. You had to take the precautions, you had to investigate, you had to put the police and the military police out there. You had to secure the scene and do all those kind of things. But it was normally done in a very calm demeanor. Because of the Washington Naval base on 9th and m street right outside the Capitol Building theres a lot of very important people. Heck the chief of Naval Operations lives on this base and you have the entire navy jag Head Quarters on this base. You add to that what happened in 2013. You have to take action. Truthfully, what im seeing right now is perhaps a little bit of over reaction by the civilian police force trying to coordinate the scene and get the right response in place. Can you talk to us a little bit about security measures on these bases, how theyve been stepped up in the wake of attacks like the 2013 attack there. Yeah. Certainly. A few months ago all the military bases in the United States went to force Protection Level bravo or b. What that means is every single individual was checked as they come onto the base. You have some independent and random searches of vehicles as they come onto the base. You have increased security patrolling throughout the base itself and if there happen to be family quarters on the base theres going to be more presence of security personnel in those bases. And i think when you have a 4th of july weekend like this when a lot of people are getting ready to leave for a three or a four day weekend, youre going to see a special amount of security extra special checks on those id cards in those cars. They will probably take more cars than just a random number to check. They may have dogs at the base. I assume they have dogs at the naval base in washington, so theyre checking every once in a while every fifth or sixth car to make sure theres no explosive devices. In Protection Level bravo, there is no specific threat. Its just a heightened alert. Jim acosta said when it goes to charlie then you know someones looking to attack a specific place or you have a speck threat. We dont have that in the military right now. But you do have the admonishment to all of isis to attack everywhere they can. Im sure thats what increasing the security concerns at the Washington Naval yard today. Thank you. Stay with me. I do want to go now to senator richard blumenthal. He joins me live. Youre part of the Senate Armed Services committee. What can you tell me in terms of any information you may have received at this point in time about this potential threat . One point to keep in perspective poppy, is that this base is vurgeirtually down the block from the United States capitol. Its not just any base. Its a big strategically important base one that unfortunately has been victimized by terror before. And it is a virtual neighbor to most of the United States government, including the capital capitol and not that far from the white house. This heightened precaution all the security youre seeing playing out is well justified. To say its an overreaction i think is a subjective judgment. I dont disagree with the opinions that have been offered, but i think that too much security is first of all a well warranted reaction here given the history. Can you tell us, sir, given that your Office Building when youre in washington is blocks from here about any changes in security internally structurally that have been set up there at the Washington Navy yard in the wake of what happened on september 16th of 2013 in the wake of that shooting . The heightened security procedures that have been adopted based on what we know from the attack that occurred previously, liberty to talk in detail about them. The capitol, as well as over official washington buildings are on better and higher alert in this kind of situation to protect anyone whos working there anyone whos visiting anyone who may be in the vicinity. What we have heard, our pamela brown reporting from her Law Enforcement sources is that senator this was a 911 call that came in that reported a shooting on the second floor of building 197, the same building where the 2013 shooting happened, but that police have not found any evidence of a shooting. Also i want to emphasize here no gunmen have been spotted at this point in time no one has said that they heard gunshots. Given all of this is this the reaction we should be seeing to threats like this . Are you encouraged frankly, given the heightened alert for potential terrorist activity across this nation around the independence holiday . Are you encouraged at the reaction youre seeing to this 911 call . Im heartened that this kind of threat is taken seriously, the kind of publicity its being given, i think, reflects the time of year, the atmospherics the sense that people are much more watchful and thats all to the good. But at the same time i hope that we will enjoy this 4th of july. Whats great about america is its openness, its freedom, it celebration of its history based on an open and free society. And i think we all ought to go about enjoying and celebrating those wonderful gifts that makes us the greatest strongest nation in the history of the world. Absolutely. Senator thank you very much. If you could stand by with me i do want to go all right. We do have one update for you because last hour we talked to a member of the vanavy who was on base inside when the lockdown began. We want you to listen to his perspective. We heard someone scream get out of the Building Stay away from the cafeteria. And we saw everyone running for the exits or adjoining offices. And just you know we werent near an exit. So there was no time to try to get to an exit. So we just sheltered in the office. And that was the last we saw. But there was no struggle or nick anything like that. Was there any mention of a weapon . No not from what we could hear. There was no mention of a gunshot near the cafeteria or anything like that no mention of anything like that. Just get