This day in history: March 22, 2017

Terrorist attack occurs on London's Westminster Bridge and Houses of Parliament.
3:44 | 03/01/19

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Transcript for This day in history: March 22, 2017
The death hole rising from that deadly attack in London. A single attacker use your car as his weapon mowing down people want to bridge the British parliament. People running for their lives you see here that iconic building put a lock down. One of the victims and local river below the attacker crashing his call are they going after a police officer stabbing him. Authorities finally stopping the attack with a bullet he alleged terrorists did not survive. But for his victims are also dead including dep police officer at least forty people are injured. Tonight the desperate search for clues and a motive ABC's Alex Moore court reporting from London takes us inside the attack. In the heart of London's. Panicked crowds in the streets outside the Palace of Westminster. Tonight the attack being treated as a terrorist incident. Instantly paralyzed. People fleeing as gunshots ring out. Police shouting at pedestrians. Authorities there arrived at the scene locking down parliament. This sizzler suspended the police wait via the attack unfolding just before 3 PM on the busy Westminster bridge right before rush hour. You can see the car as it barrels across the bridge highlighted there on the right. Then watched a woman near the middle of the bridge falls landing in the water killing at least two and injuring around when he others. His body was eventually. That's an 1010 and the us is tell all my sons holding different lies in second place among the things moments later that car crashing into this gate outside parliament just below big band. The car smoking it's good smashed the driver's side door open as crowds begin to form school buses that wild card spot to the world. Street was thought Iran. From above from the famous long denied these tourists watching the carnage below. If you're lucky island all this happened he quirk would use it. On the bridge when things that struck us. That isn't spending its with the victims on the ground. Authorities say the suspect then exits the car to continue the deadly Rampage. Inside parliament's grounds stabbing and killing a police officer who was standing guard one witness watching from a window. We sort of 66 man in black. Letters that's something they haven't looked like steak and we could see the man leaving it on in a way that suggested he was understanding all striking. They policeman. Police fire taking the suspect down. These images in the immediate aftermath show one officers seeming to appoint his gun act the alleged suspect. What appears to be a knife under the officers' right foot. Police load the alleged suspect onto a stretcher and into an ambulance the suspect later dined. Parliamentarians under armed guard prime minister Teresa may rush to safety. Outside that braids who brought to a standstill. Bystanders rushing to a victim's aid first responders performing triage as helicopters were dispatched to rescue the wounded. Tonight a search is under way to make sure there were no other attackers. As stories of heroism begin to emerge one member of parliament to bias Ellwood with his face bloodied performing mouth to mouth. Trying to save that police officer who was stabbed and later died.

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

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