- Man was arrested at Canonbury after reports he made threats to kill
- Passenger from the Overground train say he claimed 'he knew people from ISIS'
- Driver stopped train and let passengers off before police arrived to make arrest
Onlookers claim the man boarded the London Overground train travelling for Richmond and started shouting at passengers when it stopped at Canonbury station.
He claimed his 'cousin was one of the bombers in the Manchester attack' before telling shocked passengers he had a weapon, one witness said.
Commuters shuffled towards the doors before the driver let everyone off and the police arrived, a passenger told MailOnline.
British Transport Police confirmed they arrested a 27-year-old man following the incident and he remains in police custody while enquiries continue.
Armed police swooped on a London station yesterday and arrested a man who a witness said was claiming 'I know people from ISIS'
A commuter, on his way to work a night shift at John Lewis, filmed armed officers arresting the man and admitted passengers were left 'scared'.
A video shows the man lying on the floor with his arms out while more police arrive, and a second clip shows the arrested man with his arms behind his back.
The eyewitness claimed: 'I got on the train to go to work and he was already on there. He was in the middle of the carriage shouting at people.
'He was saying "I've got a gun". He was saying "Watch out what I'm going to do to you if you say anything".
'He was being racist too shouting "the white people in this country don't work" and he said "only the Eastern Europeans do work here".
'He was shouting and saying one of his cousins was one of the bombers in the Manchester attack.
'He was shouting "I know all about ISIS" and "I know people from ISIS". He was shouting all this abusive stuff. People were moving away from him slowly.'
The man was ordered onto the ground and arrested. Police say no gun was found at the scene
The witness added: 'The train stopped and the doors opened again and the driver came on and said "we've got a technical problem if you want to get off and get some fresh air, please do so".
'As soon as the doors opened everyone rushed out onto the platform. He came out too and he was still shouting the same stuff.
'The police arrived really fast. Six or seven of them with big guns came on to the platform and told him to get out the train.
'He carried on shouting. They told him to get on the floor and to put his legs together and all that and arrested him.
'I've got to be honest, I was kind of scared. I got off that train as soon as I could.'
The incident unfolded at Canonbury station, north London yesterday evening
The train was delayed at the overground station for around 20 or 30 minutes while police took details from staff and passengers, the witness said.
British Transport Police are appealing for information.
A spokesman said: 'Just before 9.30pm yesterday evening, officers were called to Canonbury London Overground station following reports of a man stating he had a gun.
'Specialist firearms officers from BTP attended the scene and a 27-year-old man from Enfield was arrested on suspicion of threats to kill.
'No firearm was recovered during the arrest. The man remains in police custody whilst enquiries continue.'