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Armed police have been pictured arresting a man after a horror attack on the Tube which left a victim with "the side of his head hanging off".
The suspect was led out of Green Park station after police were called to reports of a man attacking a passenger with a "foot-long machete".
It happened shortly before 7pm last night on the Jubilee Line in the capital.
A passenger in his 30s, who was among those trapped in a carriage with the attacker, said he feared he would be "hacked to death underground".
The witness, who did not want to be named, said: "All of a sudden there was a huge commotion.
A man is helped by paramedics following the attack on the Jubilee Line last night
"A man stood in the middle of the carriage and brandished a foot-long black machete.
"People started screaming, there was a stampede to the front carriage – people got trampled on and pushed into the plastic and stuff."
The witness said he moved into the next carriage away from the attacker, adding that the victim had a wound on his head which he described as "a deep gash meaning the side of his head was hanging off".
He added that the driver was unaware of anything happening for 10 minutes because the intercom was not working, and passengers were left defenceless on the moving Tube as the attacker "taunted" them.
A suspect was led away by armed police following the incident shortly before 7pm
"The attacker went back down the train. We heard screaming but we don't know what happened," he said.
"He then came back and stood at the opposite end of the carriage taunting us and making out he was going to break down the door of the carriage.
"It was completely and utterly terrifying. For about 10 minutes I genuinely thought I would be hacked to death underground.
"However, people showed compassion and care for each other – people held other's hands, and a teenage boy saved his mum from being trampled."
The witness said the Tube train eventually stopped and armed police arrested the attacker, who did not resist them.
BTP said a man has been arrested on suspicion of inflicting grievous bodily harm, and that Green Park station has been closed.
Paramedics also attended the scene and took the victim to a nearby hospital.