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A man has been tasered by police after a suspected terror attack in a Tube station just days after Parliament voted to extend bombing to Syria.

The suspect is alleged to have been attacking people as they left Leytonstone Underground Station in east London last night.

One witness claims the man shouted "This was for Syria" as he was being led away by police.

Read more: Leytonstone stabbing victim speaks out

A man aged 56 is in a serious condition in hospital after he was stabbed while two others were also hurt in the horror - which police are now treating as terrorism.

He is lying on his side with his arm supporting him and his hand sitting in the blood.

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A horrified onlooker remarks "f****** hell" as the suspected grey-haired victim barely moves.

Commander Richard Walton, who leads the Met's Counter Terrorism Command, said: "We are treating this as a terrorist incident. I would urge the public to remain calm, but alert and vigilant.

"The threat from terrorism remains at severe, which means that a terrorist attack is highly likely.

Read more: Police warn more attacks "highly likely" as officers treat Tube horror as "terrorist incident"

"I would appeal to anyone who was in the vicinity of Leytonstone underground station earlier this evening at around 7pm who saw anything suspicious to call the anti-terror hotline on 0800 789 321.

"Anyone who may have captured video or photographic footage of the incident is also urged to make contact with the Counter Terrorism Command via the Anti Terror hotline".

As news of the attack broke, Labour leader Jeremy Corbyn tweeted his thoughts on the "shocking attack".

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He said: "The stabbing in Leytonstone is absolutely shocking. My thoughts are with the victim and his family."

Shocking video footage has emerged showing the moment police officers confronted a man wielding a knife inside the ticket hall.

Just metres away is a gruesome pool of blood, surrounded by several red footprints.

Read more:Gruesome video shows man being tasered inside Tube station after horror "for Syria" stabbing

Dressed in brown trousers and a grey top, the man is seen pacing furious in front of the officers - who are holding back terrified members of the public.

In the footage the man is seen standing past the barriers in the ticket hall of the tube station in a stand-off with three police officers.

At one point the man appears to lunge towards the officers, who scream for commuters to get back.

As the camera pans away, he disappears out of view before screams are heard and he is seen lying on the floor.

(Image: Terence Marsden) (Image: Jonathan Brady/PA)

One onlooker shouts: "stupid idiot", as police call for him to "put it down".

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Read more: How to survive a terror attack cartoon strip produced by government in France

The man then appears to drop something with his right hand just seconds before an officer arrives and kicks it away with his foot.

Another officer then demands the man roll onto his front, which he does and is then handcuffed by two of the policemen.

A third in the background screams at passers-by to "get out", before one onlooker shouts out "You ain't no Muslim bruv" three times.

(Image: Jonathan Brady/PA) (Image: Jonathan Brady/PA)

A Metropolitan Police spokesman confirmed the force was called to the station just after 7pm

One person, who claims to have witnessed the attack, took to Twitter to reveal details of the horror.

Laurynas Godvisa said: "So as I was going to Leytonstone station was dressed to go to Christmas dinner with people from work.

"As I walked down I just saw a lot of people running but I ignored it and kept walking to get my train, but suddenly what I saw I couldn't believe my eyes and what I saw was I guy with a knife and a dead guy on the floor.

(Image: Jonathan Brady/PA) (Image: Jonathan Brady/PA)

"I was so scared I ran for my life. After good 10-15 police came and got the guy and arrested him.

"And as he was coming out this is what he said "This is what happens when you f*** with mother Syria all of your blood will be spilled"."

Horrific video from the scene shows a large pool of blood on the floor as stunned commuters run away.

Bloody footprints can be seen surrounding the large puddle of blood.

The attack comes just weeks after 130 people were slaughtered on the streets of Paris in a series of chilling attacks.

A spokesman said: "Police were called at 19:06hrs on Saturday, 5 December, to reports of a number of people stabbed at the station.

"The male suspect was reportedly threatening other people with a knife.

"Met officers attended the scene. A man was arrested at 19:14hrs and taken to an east London police station where he remains in custody.

"A TASER was discharged by one of the Met officers.

One man has sustained serious knife injuries; these are not believed at this stage to be life-threatening.

"Two other people have sustained minor injuries."

A spokeswoman from London Ambulance Service said: "We were called at 7:09pm to reports of an assault at Leytonstone underground station.

"We sent a number of resources including our joint response unit, an incident response officer, an ambulance crew and London's Air Ambulance to the scene.

"We treated a man for stab wounds.

"He was taken as a priority to hospital escorted by the doctor from London's Air Ambulance."

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