A man has been arrested after a stabbing at Leytonstone Tube station in which it is claimed he screamed "this is for Syria".
Scotland Yard were called just after 7pm to reports a man's throat was slashed in an attack inside the Tube station and other people were being threatened with a knife.
Horrific images circulating on Twitter show a pool of blood on the floor near the ticket barriers and a confrontation in the station.
A video shows witnesses shouting at the man to drop his weapon before he is apprehended by officers.
Police confirmed a Taser had been used at the station.
According to Sky News, the alleged suspect shouted "this is for Syria" but the Met have not confirmed it.
GRAPHIC CONTENT WARNING
Leytonstone Station. The stabbing incident. This is crazy. pic.twitter.com/9wAUpGTa6K
— Diego Dan$o™ (@OhYeahGuy) December 5, 2015
A Met spokesman said: "Police were called at 7:06pm on Saturday, December 5, to reports of a stabbing at Leytonstone underground station. The male suspect was reportedly threatening other people with a knife.
"Met officers attended the scene. A man was arrested at 19:14pm and taken to an east London police station where he remains in custody. A Taser was discharged by one of the Met officers.
"Officers from British Transport Police are now dealing with the incident at the scene. We are aware of one man having sustained serious stab injuries. We await details of any other injuries."
He was taken to an east London police station where he remains in custody.
Horrific scenes at Leytonstone station. 1 confirmed stabbing however rumours are 2 people have been stabbed. pic.twitter.com/xNRawShOxw
— Khayam (@khayamcreates) December 5, 2015
Transport for London said the incident had sparked delays on the entire Central Line.
Steve Griffiths, London Underground's Chief Operating Officer, said: "Leytonstone station is currently closed whilst the police investigate an incident that occurred earlier. We're assisting the police as necessary and will reopen the station as soon as possible."