Citizens take down terrorist on London Bridge

In newly released images, people are seen standing up against a knife-wielding terrorist by grabbing anything nearby until police arrived at the scene and fatally shot the attacker.
2:12 | 12/02/19

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Transcript for Citizens take down terrorist on London Bridge
Zachary, thank you. Overseas new images of the heroic takedown on the London bridge. Heros stepping up with make-shift weapons to stop a convicted terrorist who went on a rampage killing two people with a knife. Tonight there are questions why that terrorist was released from prison after serving after his sentence. Ian Pannell is in London. Reporter: Tonight, tales of heroism emerging in the terror attack on London bridge. This video showing people fighting back with anything they could get their hands on. They used fire extinguishers. They used chairs. They used these narwhal tusks ripped off the wall in the heat of the moment. I'm proud to know them. Reporter: The two dead, now identified as 25-year-old jack Merritt, working in the justice system. His family saying he always took the side of the underdog. And 23-year-old saskia Jones, also a graduate of Cambridge. Her family saying she saw the best in all people. This is an attack on our community in many ways. It was intended as such. Reporter: The attacker Usman khan was killed by police at the scene. Police say he had ties with Al Qaeda and had been released prison serving half of his 16-year sentence. In this bbc interview from 2008, khan denied he was an extremist. These labels what they're putting on us, like a terrorist, this, that, they will know. I ain't no terrorist. Reporter: Khan was one of 75 convicted terrorists freed early. Prime minister Boris Johnson calling the laws allowing for this early release "Ridiculous" and "Repulsive." They are being properly invigilated to make sure there is no threat. Reporter: Tonight, services held for the victims of the attacks, while two others remain in the hospital. Ian Pannell joins us live from the London bridge. Authorities have announced an additional arrest from that list of 75 convicted terrorists that were released early. Reporter: That's right. He was arrested on suspected terrorist related charges. Police are stressing this had nothing to do with the attack on London bridge. There is now growing pressure here in Britain to review sentencing guidelines. Tom? Ian, thank you.

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

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