Transcript for Deadly terror attack on London Bridge

show to the breaking news out of London. Live after the aftermath. A heavy police presence on the London bridge where the attack began. A van plowing into a crowd of people out simply enjoying a Saturday night. Three men leapt out of the the van. They went to a nearby market and began stabbing people. We want you to look at this video from inside a nearby pub where police told everyone to get down. Down, down! Everyone down. After eight minutes, police killed the three suspect ps. Here, you see one of the assail rants wearing what police say is a fake suicide vest. All of this comes less than two weeks after the horrific attack at the Ariana grande concert. You're looking at the venue where in just hours, grande will perform a benefit konser. President trump making a plea for his travel ban. We start with Terry Moran at the London bridge for us this morning. Good morning, Terry. Reporter: Good morning, Paula and Dan. It happened just behind me here. About a block away. That's borough market, and beyond it London bridge. The borougm market, one of the the truly festive parts of the city. Last night, a scene of terror. This whole area filled with people just enjoying a summer Saturday night. Yet, in moments, coming face to face with tlor. The police told us to run. Go, go! It was mass panic. Reporter: Overnight, pan Nick the streets of London. Chaos and carnage strike a summer Saturday night. A deadly terrorist attack carried out in two locations. There was a police car. Sirens going after everywhere. Reporter: The assault began shortly after 10:00 London time. A white van swerves, levers the rodeway, and starts plowing into pedestrians. We heard a crash almost. A loud noise. Reporter: That van coming to a stop just past the end of London bridge. Steps away from the bustling borough market. Three men armed with long blades, they start slashing and stabbing people. The attackers were shouting this is for Allah. I saw loads of people run away from the market. There were people lying on the the ground. He went up and stabbed this girl I don't know how many time, ten times, maybe 15 times. Reporter: Eyewitnesss to the horrifying events describing the panic as londoners scrambled to safety. We didn't know where the shooting was coming from. So we all just laid down on the floor of the cab. Would you please leave the area! For your own safety. Reporter: Terrified crowds hustled to safety. Told by police to keep their hands on their heads. Officers swarmed the the scene, pinning down the attackers. And then in hail of gunfire, the the police shoot and kill all three male suspects within igt minutes on of the first call. They were wearing a hoax suicide belt. Seven innocent people left dead. Another 48 badly injured, including a police officer. We must come together. We must pull together and united we will take on and defeat our enemies. And back now with Terry Moran live from the uk. We heard from Theresa may right there. She's come out with forceful words this morning. Tell us more about what she's saying. Reporter: That's right, Dan. Prime minister Theresa may said things must change. She's talking about the law. Giving more resources to security services. She may talk about longer sentences for people who fall afoul of terrorism laws and lesser laws even if they're suspect of being a danger to society. There's sorrow here. Frustration. Anger. The third attack in the country in the past three months. All that said, there's a special heritage and history here in London and in Britain in the face of violence in the face of terror, going back through the I.R.A., back to World War II. It's the stiff upper LI it's for real. One way people here get through 2450ez moments. As they said in World War II, London can take it. They also said keep calm, carry on. Terry Moran, thank you very much.

This transcript has been automatically generated and may not be 100% accurate.