Tactical police on scene. Investigations ongoing. Quite a ways down the street, as well. One of the entrances is just off to the left and another one a little bit farther down the street and out of view. We spoke to a witness here who was here at the time of the explosion and said he was on his way to work and traveling on the metro as he does. Heard the blast first. He said everything went to black and when he could see, again, he saw many, many people injured. We now know that 15 have died at this attack site. And more deaths at the airport, as well. Just in terms of how the city is functioning right now. We know that the metro stations have beened and the metro has been closed. Trains are not coming into the main train station. Euro star trains have been diverted, turned around as mine was. But there actually is quite a bit of traffic on the street. There are people out and about. Traffic is extremely heavy getting out of the city and fairly heavy getting in, as well. Some talk of closing the border between france and belgium. We were able to drive straight in and, again, into the city. So, no changes there. But in terms of travelers getting into and out of the airports. The airports have been closed and, really, the city now in sort of a state of shock. People trying to figure out whats next. Do we go to work . Do we stay at home and do we collect our children. Are the phones working yet . Some have been in and out. I have been able to get some phone calls through. But it is still sort of a city influx right now, guys. Thanks, kelly, on the scene there. I know youll continue to keep us posted. She mentioned she was able, matt, to just drive in rather easily. Which i was surprised. On the other hand you have been remarking and you know this area very well. These are porousers. Not one singular checkpoint that could be closed. Kelly and her team were able to drive right to the area where that metro attack took place and not be stopped in the process. You can see the streets look basically deserted. Pete williams has been joining us with information with his colleague sources. Pete, what can you tell us . As we have been saying earlier today, matt. The administratior who will hav a big role is actually in brussels. Coincidentally there for meetings and he is not at the airport. He is safe at the embassy now. By the way, tsa is checking on the safety of federal air marshals that regularly travel into and out of this airport as they monitor and fly on flights into the u. S. From brussels. So, some were coming in psome were going out. Tsa is checking to see if they are safe. We have had no confirmed reports of american casualties either in the dead or injured at the Brussels Airport or at the bombing of the subway car. In terms of the u. S. Response, there has been no recommendation from the federal government that airports or mass transit in the u. S. Should do anything different. A number of federal agencies. The fbi, justice department, Homeland Security, tsa, the Transportation Department. Theyre all sending messages to the operators of these systems telling them whats going on in brussels. Frankly, passing along what is being reported and social media and the decisions on what to do are up to local authorities. Weve seen much more visible Police Presence at Dulles Airport here outside washington and at the airports in new york and also additional reports and the police in boston say they have adequate resources in place and all of that is because there is no intelligence, no specific information to indicate that there are any such attacks against these targets in the u. S. So, can i ask you a question. We learned that belgium officials have raised their Terror Threat level to the highest possible level. If youre a citizen of belgium, that means that you exercise the utmost vigilance. What does it actually mean for Law Enforcement in belgium or a country like that . It varies. It probably means that they have specific duties and special places theyre supposed to go to. The teams that are responsible for rooting out these terrorists have kind of been working 24 7 for the last several days. And what it is going to mean is that as they investigate these attacks. As they find fragments of evidence that will give them new leads will then be additional things that they can follow up on. But it means a lot more viz presence guarding public facilities all throughout belgium. It is going to be very different duty for them than it would be here. One last thing don was just here and commented on this. The discovery of that undetonated suicide belt at the airport. Thats a huge lead for investigators. Absolutely. If that report is confirmed and turns out it be true, then that will be a huge cache of evidence theyll look at. Theyll try to trace where all the components came from and looking for fingerprints and dna. People who make suicide vests tend to think theyre not going it be left behind. So, they may not have been very careful in how they put it together. And the hope will be very high that there is going to be enough. Remember, it was a dna trace found in one of the places where the police in belgium searched that led them to believe that the main terror figure was still alive and that also gave them an additional name of a person that theyre looking for. So, those are the traces of evidence can be extremely important. Been reports here and there and yet confirmed by us but weaponry recovered at the airport, as well. And that potentially could be a treasuretrove of evidence. Pete, thank you very much. Lets go to tom costello. I understand you have some news for us. Couple pieces of information for you. Vtm is reporting that the doctors who are treating the victims are reporting significant nail injuries. They believe that the bombs may have been packed with nails. They have been pulling pieces of nails and shrapnel out of the victims and there is from, thats from a doctor at a hospital in belgium. Major trauma center. My kids were born there, actually. There have been one or more amputations already as a result of the injuries. Also, the French Security forces. French Security Forces have crossed the border and are responding to assist belgium authorities. They are arriving in downtown brussels. As you would expect, moving at great haste across the countryside tahelp pull up the main city center of the capital there. So, of course where the european is and then down through the brussels, belgian government offices. By the way, the u. S. Embassy is not far that either. Guys, back to you. They have been told to shelter in place. U. S. Embassy officials are okay, no reported injuries among them. It goes without saying, but ill say it anyway. In a story like this as it unfolds well start to get more and more images from the scenes of these explosions either images or from individuals who have taken pictures with their cell phones. We are going to be very careful in deciding what to put on the air and well warn you because, obviously, a lot of those images that we may see are going to be extremely graphic. Thats right. Lets turn to Richard Engel and always a wealth of information about the context on a day like this. Richard, what more can you add . I can tell you u. S. Counterterrorism officials are watching this very closely and are asking themselves, this is a quote, how big is this cell . So, they certainly believe or suspect that there are more people involved than just the bombers who carried out this attack. When asked what the u. S. Officials think that this could be the start of a wave of attacks in europe by isis the answer i was given is likely. Not good news coming from u. S. Counterterrorism officials as they watch this. They think that there are more suspects involved in this cell and that this could be likely, i was told, a start of another wave of attacks in europe by isis. And that does dove tail with information we got earlier today from intelligent sources saying there are a few dozen. 50 to 100 syrian mill in europe at the moment looking for targets. So, none of this good news. Chilling detail that we just got from tom costello who has been monitoring some of the local television and saying that some of the injuries that doctors are finding and treating there are consistent with nails. Attack would nails. Unfortunately, something weve seen before. On the other hand, richard as you well know, it may be as authorities get into the forensics and able to pore through that scene sometimes you can find a signature of a particular bombmaker or a style of attack. Its very standard that they pack suicide vests with nails or ball bearings and put other materials inside the vest. Rat poison is one that sometimes is used. All of these things are, unfortunately now, readily available online. Isis websites and platforms and magazines. Theyll put the manuals out so people can learn how to make them. Then Law Enforcement officials in a cat and mouse game trying to take them down only to see them reposted, again. But you can imagine what it would be like in that airport. I am looking right now at the scene with all the smoke hanging in the air. When these apparently nail incrusted suicide vests detonated inside the airport. Sometimes, richard, its not just the imnls but the sounds and this is video that has audio along with it. You can hear the cries for help and the screams and the seconds immediately following one of those blasts. It is very, very haunting and difficult to watch. Richard, thank you. Well be back with you in a little while, all right. Sure. Well be back with more of our coverage right after this. 6 15 out west. We are continuing our special coverage of the terror attacks in belgium overnight. We are joined now on the phone by democratic president ial frontrunner hillary clinton. The former secretary of state. Secretary clinton, good morning to you. Good morning, matt. From your time as secretary of state you know that area very well. You know belgium well. What was your initial reaction when you heard news . Well, it was just terrible horror. The idea that terrorists are continuing to strike at the heart of europe and now brussels and the number of casualties from what looks to be fairly sophisticated, coordinated attacks is deeply distressing. Weve got to stand in aul solidy allies as they have stood with us on so many occasions and we have to intensify our efforts to find and prevent terrorists from ever doing this, again. So, its going to be a long challenge because there is a lot of factors, including, you know, the accessibility to powerful explosives and the mobility of terrorists ins world. But weve got to be absolutely strong and smart and steady in how we respond. Secretary clinton, its savannah guthrie. As you well know we arent yet aware whether isis is taking responsibility for this. If isis directed this or if isis nearly inspired this. Nonetheless, i think we all agree that isis is really at the heart of this. If you were president today, what would we be doing differently to try to get at this root cause . Well, savannah, youre right that were not sure yet. But its also true that, you know, we have been confronting the threat of terrorism for quite some time. And this is the latest terrible manifestation of it. We have to tighten our security. I talked about a visa system and a passenger name record system. When i was secretary of state, we often had some difficulties with our european friends because they were reluctant to impose the kind of strict standards we were looking for. After paris has changed and we need to do much more to tighten things up. And i know Security Professionals are working to do that. But its unreal isoic to say that were going to completely shut down our borders to everyone. That would stop commerce, for example. Thats not in anybodys interest. But we have to do a much better job in coordination with the europeans on tracking and following anyone who has any connection with terrorist activity or terrorism. Secretary clinton, when the European Union was established, borders became basically invisible. Anybody could travel between Different Countries in europe, incredibly easily. Do you think europe is going to have to reconsider that now that we see how easily terrorists have moved, for example, between france and belgium and other countries . You know, matt, i think they are already considering it. The dream of a whole bring europe back with that speech is one that should not be walked away from. It was an essential development after the horrors of world war ii. But, we dahave to be realistic with how people move from place to place and it has been my understanding that the europeans are looking hard at how to better protect their borders internally. And, of course, they are hoping with this extraordinary wave of Syrian Refugees and refugees from other products that the middle east and south asia. They have labored to do that on appropriate way. But that, too, poses extra burdens on them. This is a time for us, you know, to reaffirm our solidarity with our european friends and allies individually and for nato to support them as they struggle with how to best defeat the terrorist threats, they say. Secretary clinton, this is a time to think about what the proper policy response is, what the Law Enforcement response is, but i just keep thinking of someone sitting at home and watching these images and thinking about europe and our friends in western europe and wondering, could Something Like this happen here . Is this something that people should fear . Well, savannah, i think weve got to recognize that the threat posed by the modern incarnation of terrorism is one that we have to be vigilant against. And i know that americans have every reason to be frightened about what they see and what happened to us in San Bernardino. And, remember, the terrorists are trying to undermine the Democratic Values that are at our way of life. We cannot let them succeed. We have to intensify our efforts to keep america safe and to work with our friends and allies to help them be safe, as well, from these threats. You know, it seems, secretary clinton, that information is so vital when it comes to combatting terrorism and that is why, perhaps, perhaps you hear some people say when you get a key suspect like the one who was taken into custody in brussels last friday maybe you should use some enhance techniques to get information out of that person. It also may be why, if you look at this country in the wake of the San Bernardino shootings that you just brought up a lot of people say, wait a minute, apple, youve got to unlock that phone that was left behind by one of theers because it is crucial that we get that information. Is that just simply a logical step that people take after events like this and do you agree with it . You know, matt, i think it is understandable that people would be asking those kind of questions. You know, as to water dep boarding, you know, our countries most experienced and bravest military leaders will tell you that torture is not effective. It does put our own soldiers and increasingly our own civilians at risk. But we do have to give Law Enforcement and intelligence professionals all the tools they need to the job to keep america safe. And they dont need to resort to torture, but they are going to need more help. And, you know, just yesterday i said with respect to the question about the cell phone. I just cant believe that we cant find a reasonable path forward here. Trying to help our Law Enforcement professionals get the information they need to follow up on a task. But most importantly, to prevent them. And that, you know, the privacy and safety of people who lose their lives or be injured in an attack have to be weighed against the privacy and safety of our information. And i just still believe theres got to be a way our great Tech Companies and our Law Enforcement professionals to figure out how to deal with that. It appears from the early reporting on the capture of the terrorist suspects in brussels that one of the ways he was tracked down was through the use of his cell phone. And we also know that terrorists are not stupid. They are quickly adapting and the more they use encryption to communicate, you know, the more difficult it is going to be to figure out what the heck theyre up to. We have to work this through consistent with our values. All right, secretary clinton, wei joining us this morning. We appreciate your time. Thank you. I appreciate the way youre handling this very serious matter. Thank you very much. Were back right after this with more of our coverage. Fw morning. We continue to follow horrifying and tragic news from belgium. Killing 26 people and a fresh wave of terrorist attacks. Nbc news covering that throughout the morning and well get back to that momentarily. First, we want to get you updated when it comes to our local weather and kind of drizzly out there. Lets check in with kari. We have wet conditions out there as you head out this morning heavier rain moved through the south bay earlier and were still left with the wet roads as you head out the door for work or school. Much of the rain has pretty much tapered off and were only seeing spotty, light showers across parts of the peninsula and for the most part chilly temperatures. Its now 39 degrees in santa rosa and 40 in napa and 50 now in san car rose and San Francisco 54 degrees. High temperatures today will be topping out around the low 60s. Even some upper 50s in some spots like redwood city. The embarcadero up to 6 o0 degrees and 61 in san rafael and hayward 59 degrees and livermore 59 degrees and a mix of sun and clouds. Even though much of the rain has moved out, we will have a chance of spotty shower or two. This is a look at the rain timeline and it looks like what the radar can show up and moisture streaming through that could be enough to give us spotty showers throughout the early afternoon, even into the evening. But mainly over the hilltops. The wind forecast keeps it breezy through the day. The winds up to about 15 to 20 miles an hour and then even increasing as we go into later tonight. Up to 25 miles per hour. So, it will be breezy and cool today behind that cold front that moves through and our high temperatures today much cooler than where we should be for the middle to end of march. The rain ending today, but we will still have, once again,