Paramedics also attended and the passenger has been taken to a nearby hospital.
Green Park station was evacuated and closed.
Writing on Twitter, one user claimed: ‘My daughter was in the train behind- no announcements for 50 mins whilst train stopped in tunnel and passengers scared.’
Another described ‘alarms and the long wait for the police to arrive’, adding: ‘I was and still am scared.’
BTP Superintendent Mark Lawrie tweeted: ‘Due to an incident at #greenpark the station was closed but will be reopened imminently.
‘Victim being cared for at hospital. No officers injured, weapon recovered.’
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