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A teenager was stabbed in the ticket hall at Archway station and then travelled two stops on the Tube with serious knife wounds before being found.

The 15-year-old was found today at about 11am in The Causeway, at the rear of East Finchley Tube station.

He was taken to hospital where his condition is serious but stable.

Police said he was stabbed in Archway and is then thought to have travelled two stops on the Northern Line to East Finchley.

Another male is also thought to have sustained slash injuries in the attack and detectives are keen to trace him, police said.

Witnesses said there was a "large amount" of blood around Archway station, which was closed for several hours as forensics officers assessed the scene.

A number of youths were involved, and witnesses said there were screams coming from the north London Tube station.

Detectives are hunting four suspects, who were all said to be wearing grey tops with their hoods up.

Forensic officers at Archway tube station after a stabbing. Station still closed @IslingtonTrib pic.twitter.com/ZQ63Z7oWl5 — Joe Cooper (@ReporterJoeC) July 1, 2015

Local police officers in Islington tweeted to say the Trident gang crime command was investigating. They added that the attack was "not linked to local youth issues".

A 17-year-old who witnessed the aftermath, who gave his name only as Alex, said: "I was around the corner waiting for a bus and I heard some shouting in the direction of the station.

"Then when I saw people being told to leave the station I realised something was wrong.

"Soon after the emergency services arrived and taped off the station.

"I came back past the station later and there was a forensic team working in the ticket hall."

A spokesman for the Metropolitan Police said: "At this early stage it is believed the male may have been stabbed several miles away in the Archway areas before travelling to East Finchley.

"Enquiries continue to establish full circumstances."

No arrests have been made.

Archway station reopened at about 4pm.

Contact police on 101 with any information. Alternatively call Crimestoppers anonymously on 0800 555 111.