Video shows citizens taking on terrorist suspect in deadly stabbings in London

Usman Khan, a convicted terrorist, was shot dead by police on a bridge after he allegedly wounded three and killed two.
1:27 | 12/03/19

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Transcript for Video shows citizens taking on terrorist suspect in deadly stabbings in London
tonight after that deadly attack on London bridge. The heroes who ran toward the convicted terrorist, taking him down with whoever they could find. One with a fire extinguisher. And they did this even though at the time it appeared he was wearing what was a suicide vest. It would turn out to be a fake, but they did it anyway. ABC's senior foreign correspondent Ian Pannell with the American who witnessed this. Reporter: This is the dramatic takedown. Citizens attacking a terrorist with a fire extinguisher, another man wielding a whale tusk. And for the first time, details from inside the building when the attack started. An American eyewitness watching jack Merrit lay down his life. He was the first line of defense. He was the first person to confront him at the door. Reporter: People taking on terrorist Usman khan, even though he appeared to be wearing a suicide vest, later turning out to be fake. Khan was shot dead by police. Khan was one of 75 inmates released early from terrorism convictions, having served just half of his 16-year sentence. Now there's pressure to change the law. Merrit's own family fighting for his legacy, saying he believed in redemption and rehabilitation, not revenge. Police believe khan acted alone, but the authorities are now reviewing all cases of terrorist offenders released early from prison. David? Ian Pannell tonight. Ian, thank you.

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

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