Armed police have been called to Hackney Central Overground station in east London.
British Transport Police said one person has been taken to hospital, and it is understood they are in a critical condition.
The force said on Twitter that the station will remain closed while officers respond to the incident.
A London Ambulance Service spokesperson said: ‘We were called today at 1.24pm to reports of an incident at Hackney Central Station, Hackney.
‘We sent a number of resources to the scene, including an incident response officer, two ambulance crews and a medic in a fast response car. We also dispatched London’s Air Ambulance.
‘Our first medic arrived within three minutes.
‘We treated a man at the scene and took him to a major trauma centre as a priority.’
An air ambulance was reportedly seen landing near the station earlier this afternoon.
In a tweet, Hackney Council said: ‘There has been a police incident at Hackney Central Station and it is currently closed.
‘We will share more information as it becomes available. Please avoid the station for the time being.’
The Met Police told Metro.co.uk that British Transport Police were leading the investigation.
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