Sidewalk weaponizing that vehicle hitting pedestrians and the three attackers starting attacking people on foot in bars and nearby restaurants of the market. The Police Killed them within eight minutes from the start of this attack. No group has claimed responsibility so far. Both Prime Minister theresa may and london mayor sadiq khan spoke earlier today. We believe we are experiencing a new trend in the threat we face. As terrorism breeds terrorism and perpetrators are inspired to attack, not only on the basis of carefully constructed plots after years of planning and training, and not even as lone attackers radicalized online, but by copying one another and often using the crudest of means of attack. One of the things the terrorists want to do is disrupt our way of life and stop us from enjoying freedoms we have, mingling and mixing having a good time. They want to stop voting on thursday in the general elections and enjoy the democracy we have. We cant let them do that. Nor will we let them win. The London Police commissioner talked about the speed of which First Responders were able to stop this attack. We were able to respond to this incident extremely quickly, within literally eight minutes. We were already at a very high level of alertness. Its a very complex and confused scene and confused series of events. So its important that we first of all make sure there is no one else outstanding. Woe don we dont believe there is. The white house said in a statement that President Trump had spoken with may on the phone to offer full support and President Trump said we must stop bngolitical my correct and get down to the business of security for our people. If we dont get smart, its only going to get worse. Seven dead, 48 wounded. The mayor of london says there is no reason to be alarmed. And do you notice also right now that theres really no gun debate about all of this because this is this is all from donald trump by the way, because they use knives and a truck. Lucy kavanaugh has been reporting for us. What have we learned about the 12 different folks around london taken in . Reporter good morning, its afternoon in the early hours of this morning. Police carried out a massive operation in an area known as barking, im a block from London Bridge where the attack took place. This is a suburb of a ethnically mixed working class area. We saw a very Large Police Operation there. In connection was last nights London Bridge and market attack. They were honing in on Apartment Building and witnesses reported hearing loud bangs but they were later told by the police those were controlled explosions. 12 people taken in. We dont know the identity of the suspects or what kind of relationship she may have had with the three attackers who have been killed but we do know that more searches are taking place as we spea this is very similar to what weve seen in the aftermath of the westminster attack and manchester, people can hold people under the uk terrorism laws for ten days. They are trying to piece together who these three men were, what their motive may have been and perhaps more importantly, whether they had other accomplices and whether there was a network behind these attackers. Obviously this was a harrowing night for those who survived a terrifying night for those who lost loved ones. My colleague bill neely filed this report. Take a look. Reporter Terror Police on london streets this morning, searching for accomplices, guns drawn after another brut it wal attack that began on London Bridge. People running for their lives, the street littered with the dead and injured. Just minutes earlier, theyve been enjoying bars and restaurants when this white van accelerated onto the bridge, targeting pedestrians, zigzagging from sidewalk to road and hitting dozens. Three men then jumping from the van with knives. They went to another restaurant, the street with knives. Maybe mid20s, maybe take bit younger, all in black, black hooddyes, black hair. They started stabbing people in a crowded market district. Police warning everyone to stay down and hide. Outside, thousands were fleeing in terror. Like three men, with kind of bomb looking belt. A policeman was trying to put himself between these attackers and rest of the people trying to scare them. They shot and killed men who wore fake bomb vests wnt eight minutes of the first emergency call. We believe three suspects are dead. Reporter american intelligence now helping London Police. We have a good working relationship with youour ameri colleagues and depend on them to keep the country safe. Britains Prime Minister outraged. We believe were experiencing a new trend in the threat we face as terrorism breeds terrorism. But it is time to say enough is enough. Reporter the three terrorists havent been named. Eyewitnesses say one of them was shouting, this is for allah. Today survivors are reliving the horror. Look out across the road theres a guy throwing a table and turns out to be a heroic table throwing tables and glass at the people, which is heroic of him. Reporter police are searching for evidence and raiding buildings in london, a city braced for more. Reporter and tom a. We heard from the British Police chief constable moments ago and said the public can expect to see more Armed Police Patrols in the stets, especially in the transportation sector. He did say they do not expect at this point to raise the threat level back to critical. It is at severe at the moment which does mean an attack is highly likely though not eminent. This is a rapidly developing fluid situation and could change if they reevaluate the threat facing the public here. Four hours to your northwest, it is a big day in manchester as the benefit concert starring Ariana Grande and other celebrities are coming back to that terrorized city because of what happened there two weeks ago. What update do we have on that . Is the show still on . Reporter the show is still on. Theyve obviously as you can expect, upgraded the security. There will be more checks and checkpoints and more authorities on the ground. The message were seeing out of manchester and the one frankly were seeing out of london, this is a country that will not be coward in the face of terror. Theres an election coming up on june 8th, in four days. Theresa may said this will still continue. They are suspending campaigning for today but will resume on monday. The message to those who wish to do the country harm, keep calm sean carry on, thats the mantra were hearing over and over again in the uk and what were hearing from officials. An important show of force and support for those folks who are turning out to the Ariana Grande in spite of last nights tragic attack. Keep calm and carry on. Lucy, great to see you, thank you. Well be back to lucy in a bit. Joining me is brian dillon, former head of the ldon metropolitan Police Armed Response unit. As we heard from the Police Commissioner, eight minutes seems like a short time for police to get on the scene and also to eliminate the threat here, kill these attackers. What do you think was on the mind of these officers as they were rushing into the unknown here of this scene . I think what was on mind probably of the officers, its very difficult for me to second guess that, but essentially what we would be expecting is them to be considering their training and our officers in london and throughout the United Kingdom go through very extensive training to deal with a wide variety of threats and situations. The whole point about it keeping an open mind as to what youre going through, developing in your mind the threat assessment of the situation that youre about to confront, which will be continually be updated by information being receiving from the control room. And effectively the officers getting themselves ready to deploy very swiftly out of their vehicles to find the threat, close in on it taen neutralize it to minimize any greater loss of life amongst members of the public. As we know the investigation expending now is lucy reporting there, 12 people in east london as they were arrested in connection to the incident. We know the Police Commissioner spoke about this earlier. Lets listen to what she had to say as to how much time will go into this investigation. Its a very complex and confused scene and confused series of eventevents. Its important that we first of all make sure that there is no one else outstanding, we dont believe there is but we must make absolutely certain of that. So they want to make absolutely certain there is no one outstanding. When we think of 12 arrested in connection to this, how unlikely is it that they have been able to capture some type of cell or how likely ask that they have tapped into something that was a little more nefarious with the 12 arrests . Well, at the moment, i think what the police will be eve endeavoring to do is expand their investigative net as wide as possible. Anyone with any form of connection or association to last nights incident will be brought into custody. As much to identify whether they are involved to potentially eliminate them. We cant leave any stone unturned because this sort of thing cant be allowed to go without significant robust challenge in order to make sure that anybody responsible is outstanding hasnt been shot by the justice is brought to justice. We know as lucy reported also, campaigning is suspending for today in advance of thursdays general election there in the uk, the Prime Minister was talking about this attack saying enough is enough. But i also want to let our folks watching know more of what she had to say about this in terms of tolerance to it. Take a listen. Well, we have made significant progress in recent years, there is to be frank far too much tolerance of extremism in our country. Brian, what do you make of those comments, tolerance to extremism. Who tolerating it . Well, i think what the Prime Minister is talking about is making sure that all sections of society that there is no hiding place or room for people who have extremist views of any persuasion. That is the inher ent challenge in a democracy society, the line between what society is prepared to tolerate and whats considered being criminal. I think the Prime Minister is pointing towards having a greater debate and review leading to i would anticipate some form of new policy, new procedure of the existing strategy in order to make sure that people who might be radicalized are prevented from doing so and brought into the criminal justice system. Obviously, no one wants to stand for terrorism, but when we talk about policy and changes like that, certainly from a police perspective, brian and your deep knowledge of the uk police and metro division, how does that position Prime Minister may in terms of being intolerant to certain groups or suspecting certain groups that it seems like shes trying to put a finger toward . I think ultimately what it boils down to, everybody in the country playing their role in trying to rule out any form of radicalism. The bottom line is, theres only so much that the police and Security Forces can do to keep the public safe. We cant have armed officers on every stre corner throughout this country. And no matter how quick and robust the response is and as weve seen last night a very swift and Effective Response from the police, ultimately people in society need to ap extent police with a small p themselves to try to rule out the ideology that fuels hate and extremism and violence. Brian dill on, former head of the London MetropolitanPolice Response unit. We appreciate your insight. Why were bombers excuse me, why were attackers wearing what was now considered to be these fake suicide vests . And is it a copycat attack something the Police Suspect could come next. Well dive into that and more questions right after this. Has gotten to know our business so well, that it feels like hes a part of our team. With one phone call, he sets me up with tailored products and services. 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No, they stole a chair and threw it at me, on the back and ran towards me to try to stab me so i run away. I would have been a dead man. I would have been killed. Can you imagine the instincts there, fight, flight or freeze. There we hear about one eye witness recounting the scene of going into fight mode as we are now covering this third terror attack in the uk in three months. Joining me from london, duncan guardham and kevin barron, the ecutive editor of defense one and Senior Analyst juan saurte, for combatting terrorism under george w. Bush. Duncan, let me begin with you, we have this late morning Early Morning notification, late morning in uk about the 12 arrests that happened overnight. How likely is it that these dozen people were on the radar of the police or is it just good work based on who the three suspects are . I would say its quite likely they were on the radar. Theres an extensive number of people that are on the Security Services radar these days running up to 20,000 individuals that they have looked at over the years. And around 3,000 that are currently being looked at. So thats quite a large number. The area in east london they are looking at has been a hot bed for some activity and so i would be surprised perhaps if they werent already on the radar. Here we are two weeks past what happened in manchester and that horrendous attack that is just four hours northwest of what happened at the London Bridge in the area surrounding it. We have the Prime Minister saying that she thinks theres too much tolerance for extremism and potentially this is copycat terrorism taking place. Do you think that this was really inspired by what happened at the Westminster Bridge attack earlier this year . And also, what we just saw with the incident in manchester . Well, not just those but all of the attacks in cities on euro that e seeming more often to come from within. Im a milary reporter, i cover the pentagon and i was on the trip with secretary mattis to afghanistan last month. And i was struck more often now you hear commanders say they are focused on those terrorist groups that can or may have had the potential to plot, direct, inspire, external attacks from the region to western cities. So thats already shifted the focus you dont know battlefield. Afghanistan fran, the taliban and hack canny, its groups like this. It is definitely okay change for london. A year ago people were talking about how the british have a much longer history and different type of muslim population. But these types of attacks more often by people from within, Second Generation, it really does feel i think the Prime Minister is right, theres a shift going on. This might be a new era thats already begun. As you say, citizens, Second Generation sit zens of the country. For Law Enforcement and when we consider and to kevins reporting talking about these types of asymmetrical attacks that pair dime, from a lone wolf or small cell, how can they go beyond prevention of police, when they are happening at the soft target say at the London Bridge . Incredibly difficult. I think you have these low tech attacks with high psychological and Economic Impact hitting the hearof the metropolitan centers with violent plications, hitting western society and culture at its very heart, the heart of london on a saturday evening. We saw the paris attack disrupting the cafes and concerts, these are meant to be idealogical attacks and also meant to be strategic. And in many ways they follow the game plan that the Islamic State and al qaeda have called for. They said explicitly, dont come to the jihadi battlefield in places like iraq and syria anymore, attack in place where you can. Use things like vehicles and knives and go ahead and attack fellow citizens and cause terror and just a few days ago the Islamic State called for an allout war against the west and called on followers to do what they can. The think the problem here is you have groups like that that are in some ways directing attacks, some of the sophisticated attacks weve seen enabling others and justin spiring. You have those three cat egorie and in a environment like the uk, long lineage of jihadi to choose and certainly youve got the foreign fighters and almost 1,000 or so that have gone to iraq and syria, some of whom have come back, you have a lot of people to worry abo