A machete attacker has been filmed raining down knife blows on a victim at Edgware Road underground station.
The station was closed after police and London Ambulance Service were called to reports of a serious assault just before 5pm on November 19.
Ambulance crews and an incident response officer attended the scene to find a man had been stabbed.
He has since been taking to hospital where his injuries were assessed as non-life threatening.
Two teenaged boys, aged 16 and 17, along with a 20-year-old man have been arrested on suspicion of causing grievous bodily harm with intent. They remain in police custody.
Footage begins by showing an attacker dressed in black and grey holding a machete
The attacker, who is wearing a balaclava to cover their face, can be seen taking several swipes at a man on the ground
The camera eventually reveals the individual who was stabbed several times
A staff member for Transport for London and a person taking the train can be seen in the background
The attacker, dressed in grey sweatpants, a black hoodie and wearing a balaclava, can be seen with the enormous machete at the entrance to the station.
As an eyewitness films the vicious stabbing, the attacker can be seen making several attempts to swipe at someone laying on the ground.
After the attacker finally runs away, the camera moves in closer to reveal a man injured holding his side.
In the background, a staff member for Transport for London can be seen walking towards the injured victim.