The Metropolitan Police said its officers responded at 11:16 BST on Wednesday after receiving reports that people had been stabbed in Highfield Avenue, which runs off Golders Green Road.
The suspect is first seen on CCTV footage take on Highfield Avenue, timestamped at 11:15 BST.
He is jogging along the pavement towards Golders Green Road when he appears to attack a man, who he chases out of view.
Another clip, filmed from a car driving north along Golders Green Road, shows the suspect chasing after a man on the pavement.
More CCTV footage – timestamped to 11:20 BST – shows the suspect approaching a bus stop and repeatedly attacking a man waiting there, who he then pushes on to the road and out of view.
Multiple videos and images of the suspect being detained by police have been verified by the BBC.
One officer Tasers him, sending the suspect to the floor, while shouting at him to drop the knife.
Police can then be seen administering CPR and later footage shows the suspect being lifted on a stretcher into an ambulance.
The Metropolitan Police later released footage from the body-worn cameras of the responding officers. The clip appears to show the suspect walking towards the officers before the Taser is deployed.
Officers can be heard yelling “drop the knife” repeatedly before the suspect falls to the ground. They continue to repeat the instruction while the suspect is on the ground and as they work to restrain him.