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A 56-year-old man was stabbed in the ticket hall at Leytonstone station on Saturday evening by another man who witnesses say shouted "This is for Syria" as he slashed his throat. Another man was also injured and a woman was threatened with the knife during the incident at around 7.20pm. Distressed passers-by called the police who say they arrived on the scene within five minutes to find the man armed with the knife who also threatened them.

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" Witness

Police said they were forced to use a taser on the suspect twice as he threatened others with a knife, before they managed to arrest him. The victim was rushed to hospital in a serious condition with multiple stab wounds, paramedics said. Frightened witnesses described how their normal Saturday night out turned into a horror show.

One said the victim was an "elderly" man with a younger female family member while another said the suspect had a long knife, which looked like a machete. A video taken by another witness shows a big pool of blood just outside the ticket barrier as police confront the attacker, then taser him before putting handcuffs on him and arresting him. ***WARNING GRAPHIC CONTENT***

PA Leytonstone Tube station was closed off this evening

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" Witness

One witness, who did not want to be named, 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. "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"." Evitri Payet said fellow witnesses were shouting at the suspect: "You're not Muslim."

PA The man was seen threatening the police as well

People who had just got off the Tube ran back onto the train in a bid to escape the attacker. Police say the 56-year-old victim suffered serious injuries in the stabbing although they are not believed to be life threatening. 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.

Horrifying what's happened at Leytonstone. There's a guy shouting at him "you're not muslim" so so true No religion promotes this nonsense — Evitri Payet (@EvanCoolJ) December 5, 2015

"You ain't no Muslim" damn right, just an evil human being. “@YusufP94: Shocking scenes at Leytonstone Station pic.twitter.com/563eldHcz0” — BIG 19 (@Albz03) December 5, 2015

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

Leytonstone station stabbing Sat, December 5, 2015 A man was stabbed in the ticket hall at Leytonstone station this evening by another man who witnesses say shouted "This is for Syria" as he slashed his throat. Play slideshow REUTERS 1 of 20 Emergency responders inspecting Leytonstone tube station after a lone man injured several people in a knife attack

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."

PA The man was arrested by police

During the incident, one brave Londoner shouted at the knifeman and said: "You ain't no Muslim bruv, you ain't no Muslim." Now his words have taken Twitter by storm with the hashtag #YouAintNoMuslimBruv trending across the social media platform with users saying it is the perfect response to those trying to spread violence and terror. One user called Muthla wrote: "Best trend I've seen- #YouAintNoMuslimBruv regarding horrific attack in Leytonstone. Gotta love London for the #trend!" Another called Jackie N wrote: "#Youaintnomuslimbruv- soo proud to be a Londoner. True Muslims don't try and kill innocent bystanders. Peace to true Muslims." Chris Lowndes wrote: "#YouAintNoMuslimBruv is just perfect - real, inclusive, undermines terrorist cause."

SWNS A policeman keeps watch outside Leytonstone Tube station

The Tube station shopkeeper Salim, who saw the attack unfold and called the police, said it was "terrifying". He said: "I just hear the screaming and shouting and I thought, usually drunken people do that, but the victim was shouting 'Somebody help, somebody help'. "The tall man was punching him so hard and when they fall on the floor he started kicking him and then I called the police." He added: "When he started stabbing or cutting something on his body, everybody ran away and only three of us were here in the concourse. "It was scary and it was empty, nobody was there. "Everybody was saying 'Leave him, leave him' and shouting from a distance."

Detective Superintendent Jacqueline Sebire, from Waltham Forest, said: "This incident highlights the risks taken by our officers on a daily basis. When they are called to incidents such as these, they enter, not knowing what awaits them. "I would like to take this opportunity to praise not only their bravery in confronting the man who was in possession of a knife, but also their quick response in providing first aid to the victim whilst offering reassurance to the many members of the public who were travelling through the underground. "We will continue to provide a visible presence in the area if anyone wishes to ask for advice about personal safety. We also remain in contact with community groups and local partners."