Met Police told Express.co.uk that they received reports of a man “suffering gunshot injuries” just after 11pm in a statement.
It read: “Police were called by the London Ambulance Service shortly after 23:00hrs on Tuesday, 13 March to reports of a male suffering gunshot injuries on Seven Sisters Road close to the underground station.
“Officers, including firearms officers, and London’s Air Ambulance attended.
“The victim [no further details] was taken to an east London hospital where he remains in a stable condition.
“The Trident and Area Crime Command will be informed.
“There have been no arrests and enquiries continue.”
Esub Miah posted a video to Twitter and stated that he believed “somebody had been stabbed” as ambulances could also be seen arriving at the scene.
He wrote: “I think somebody has been stabbed outside Seven Sisters station, police and paramedics everywhere, this is madness.”
He also told Express.co.uk that police confirmed: “Somebody was attacked.
“Just spoke to a police officer and they said that somebody was attacked inside the station.
“But they cannot confirm details just yet.”
Another witness at the scene said: “One person said he saw someone lying on the floor possibly stabbed or shot”
Twitter user Stuart Harper added: “Think someone’s been stabbed at Seven Sisters in the station. Body just lying there being attended to by paramedics, told to leave.”
TFL confirmed that Seven Sisters Road at the junction of Stonebridge Road is “restricted due to an incident”.
They tweeted: “A503 Seven Sisters Road at the junction of Stonebridge Road – The road is restricted in both directions due to an incident at the tube station. Traffic is queuing on both approaches.
“The restriction is currently on the side of the road. Earlier congestion on Seven Sisters Road has dispersed. Traffic is flowing freely.”
TFL confirmed to Express.co.uk that Seven Sisters Station’s underground and overground services are still running.
A spokeswoman stated that one entrance to the station is closed.
They said: “The station is still open, we just have one entrance that is closed at the moment.”
As of 1.30am police are still reported to be at the scene and one of the entrances to Seven Sisters Station is still closed.