Officers arrived at scene outside supermarket on High Road in Streatham, south London, at 2pm today

Scotland Yard confirmed three people injured in the attack - with one man in life-threatening condition

One woman had non-life threatening injuries and the other was injured as a result of flying glass

Sources told Sky News that the attacker was known to police prior to attack this afternoon

Police said: 'The incident was quickly declared as a terrorist incident and we believe it to be Islamist-related'

Photos show lifeless body on pavement with what have been described as 'silver canisters' strapped to chest

Scotland Yard declared broad daylight carnage as a terror-related incident around an hour after first reports

Just minutes later police in Belgium shot a 'knifeman' who stabbed two people on Bevrijdingslaan in Ghent

Armed police have shot dead a suspected terrorist wearing a fake suicide vest after he grabbed a knife from a shop and stabbed a man and a woman during a brutal high-street rampage in south London.

The attack comes just three months after the London Bridge attack where Usman Khan was shot dead by armed police after he killed two people and injured three others while wearing a fake suicide vest.

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Police believe the Streatham incident - where the suspect was shot dead by armed officers as part of a proactive Counter Terrorism operation - was Islamist-related.

A man is fighting for his life in hospital while a woman has non-life threatening injuries.

Another woman received minor injuries, believed to have been caused by flying glass following the gunshot.

The attacker was known to police, sources told Sky News.

Officers raced to the scene outside a supermarket on High Road in Streatham at around 2pm today following reports of gunfire.

Photos from the scene show a lifeless body face down on the pavement with what have been described as 'silver canisters' strapped to his chest with a large knife lying beside him.

Scotland Yard said the broad-daylight carnage was a terror-related incident around an hour after first reports from the scene.

Officers raced to the scene outside a supermarket on High Road in Streatham at around 2pm today following reports of gunfire

Photos from the scene show a lifeless body face down on the pavement with what have been described as 'silver canisters' strapped to his chest with a large knife is lying beside him

Police officers inspect the suspect lying face down on Streatham High Road

The officers suddenly backed off when they spotted a fake suicide vest

The officers inspect the suspect after he was shot and lying face down on the pavement wearing a fake suicide vest

The officers quickly jump back after they spot what is now known to be a fake suicide vest

A marked police SUV with lights flashing stops in the middle of the road and officers get out

Police officers draw their weapons as they move in on the suspect

In one video, armed police can be seen approaching the suspect before suddenly backing off after they spotted what is now known to be a fake suicide vest.

The suspect is seen lying face down on the pavement as undercover officers train their guns on him.

A police SUV then speeds down the south London high street and brakes suddenly in the middle of the road.

Three officers leap from the marked car, approach the suspect with handguns drawn and appear to be examining him before they rush back.

Nardos Mulugeta, 52, a mechanical engineer who lives in Streatham, said he heard gunshots before seeing one victim lying in the street.

He said: 'I heard a shot and then there was a 20-second gap. Then there were three or four shots together.

'I went over and I saw the first victim, a male victim on the ground, near the White Lion Pub, and people were helping him.

'Then five minutes later a woman came over and said: "I've been stabbed too in the back." And then people starting helping her.

'I saw one body laying down further away. He was face-down between Argos and Iceland. It's really scary.'

Witness David Chawner said: ‘I was going to the cinema. I saw what I thought was just a shop lifting. I saw someone run down the street, bump into someone and then they fell to the ground, got up again, and then somebody shouted and then I heard what I thought was a car backfiring.

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'I didn’t assume it was a gunshot until I saw what later turned out to be two officers pointing guns at an assailant on the road.'

He added: 'And because I was going to the cinema I always carry a blanket with me. It’s a stupid thing but I always get really cold in the cinema. So I took that out my bag and gave it to them to compress the wound.'

Student Rafe Askem was walking along the High Road when he heard a man shouting 'ahh' and then saw the victim bleeding.

The 21-year-old said he saw two boys pushing a man against some shutters and heard a shout before looking over to see blood on the floor.

The student, from Streatham in south London, said: 'I saw somebody getting stabbed. It all happened very quickly.

'Then I just heard shouting and I saw people running. I saw him bleeding out.

'He didn't say anything. All I heard was him shouting out "ahh".'

A 19-year-old student from Streatham - who did not want to be named - claimed to have witnessed the shooting on Streatham High Road in front of a Boots store.

Police forensic officers with a bag at the scene in Streatham High Road, south London, after an attacker was shot dead by armed officers

Police can be seen behind a cordon in Streatham. London Ambulance Service Strategic Commander Graham Norton said: 'We were called at 1.58pm today (2 February) to reports of an incident in Streatham High Road'

Streatham 'terror attack': How the incident - that left three injured - unfolded The suspected terrorist armed with a knife rampaged through Streatham High Street before undercover officers shot him dead at around 2pm. Police said that two people had been injured, one is believed to be in a serious condition in hospital. Witnesses said the attacker was armed with a machete and had silver canisters strapped to his chest. Plain clothes officers repeatedly told the suspect to stop, according to a bystander, before they opened fire. Three shots were heard. The suspect was seen lying face down outside a Boots shop as officers aimed their guns at him. The undercover officers appear to have been in the area when the attack unfolded and dozens more police cars, as well as ambulances rushed to the scene. People were ordered to leave the area and shops were evacuated over fears the suspect was wearing a suicide vest. Scotland Yard has described the incident as 'terrorist-related.'

He said: 'I was crossing the road when I saw a man with a machete and silver canisters on his chest being chased by what I assume was an undercover police officer - as they were in civilian clothing.

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'The man was then shot. I think I heard three gun shots but I can't quite remember.

'After that I ran into the library to get to safety.

'From the library I saw a load of ambulances and armed police officers arrive on the scene.'

He said people began running into nearby stores after the incident.

'We were all informed to stay in buildings by armed police, until we were evacuated,' he said.

Dozens of emergency vehicles lined the area and an air ambulance landed on Tooting Bec Common a few hundred yards from the scene of the shooting.

The Met’s deputy assistant commissioner Lucy D’Orsi said: 'At approximately 2pm on Sunday two people were stabbed in Streatham High Road, Lambeth.

'As part of a proactive Counter Terrorism operation, armed officers were in immediate attendance and shot a male suspect, who was pronounced dead at the scene.

'A third person also received minor injuries – believed to have been caused by glass following the discharge of the police firearm.

'A device was found strapped to the body of the suspect and specialist officers attended.

'Cordons were put in place and it was quickly established that this was a hoax device.

A man is fighting for his life in hospital while a woman has non-life threatening injuries. Police forensic officers work near a car at the scene

Another woman received minor injuries, believed to have been caused by flying glass following the gunshot. Pictured: Forensic officers at the scene

A woman reacts near to the scene where a man was shot and killed by armed police. The attacker was known to police, sources told Sky News

'Three victims have been taken to south London hospitals. One man is being treated as life-threatening, one woman has non-life threatening injuries and another woman has minor injuries.

'My thoughts are with the victims and their loved-ones at this time.

'The situation has been contained and officers from the Met’s Counter Terrorism Command are now leading an investigation into the incident. The incident was quickly declared as a terrorist incident and we believe it to be Islamist-related.'

London Ambulance Service Strategic Commander Graham Norton said: 'We were called at 1.58pm today (2 February) to reports of an incident in Streatham High Road.

'We worked closely with the other emergency services and sent a number of resources including five ambulance crews, an advanced paramedic practitioner, an incident response officer and a motorcycle responder, with the first of our medics arriving in four minutes. We also dispatched London’s Air Ambulance.

'We treated three patients for injuries at the scene, and took all three people to hospital.'

The incident comes just three months after the London Bridge attack where Usman Khan was shot dead by armed police after he killed two people and injured three others while wearing a fake suicide vest. Pictured: An armed police officer recovers medical bags from the scene

A police forensics officer works outside a Boots pharmacy at the scene. Emma Taylor, from Streatham Hill, told Sun Online: 'I was walking up the high street after going for brunch with some friends and we saw a woman screaming outside a small hardware shop next to Iceland'

A police forensic officer was seen working at the scene. Dave Chawner tweeted to say: 'I had to stay with someone who'd just been #stabbed in #Streatham for 30 minutes before a single ambulance arrived'

A 33-year-old woman who lives near the scene also MailOnline how she was locked in a nearby Odeon for 20 minutes after the attack, before being rushed out a fire exit round the back. Pictured: Forensic officers at the scene

One officer was filmed telling pedestrians that the suspect was wearing a possible suicide vest before directing them away from the scene. Pictured: A forensic officer at the scene

Just minutes after the attack in London, Belgian police also shot a 'knifeman' who is thought to have stabbed two people on a busy high street in Ghent. Pictured: An armed police officer recovers medical bags from the scene

In the Belgium attack, the suspect was reportedly injured by officers in Ghent during the incident on Bevrijdingslaan, according to HLN. Pictured: A police officer at the scene

Student Rafe Askem was walking along the High Road when he heard a man shouting 'ahh' and then saw the victim bleeding. Pictured: Forensic officers after the attack

Dozens of emergency vehicles lined the area and an air ambulance landed on Tooting Bec Common a few hundred yards from the scene of the shooting. Pictured: Forensic officers at the scene

One officer was filmed telling pedestrians that the suspect was wearing a possible suicide vest before directing them away from the scene.

Just minutes after the attack in London, Belgian police also shot a 'knifeman' who is thought to have stabbed two people on a busy high street in Ghent.

The suspect was reportedly injured by officers in Ghent during the incident on Bevrijdingslaan, according to HLN.

Pictures show a man pinned to the ground by police on the busy road as witnesses watch in horror.

Police were filmed standing behind an unmarked police car and pointing their guns towards a suspect who appeared to be lying on the pavement outside the Boots store on the high street

In one video, police toting machine guns and masked undercover officers are seen approaching the suspect's body before rapidly moving away from the area

A large section of the A23 remains sealed off to traffic as buses continue to be diverted.

Prime Minister Boris Johnson has since tweeted about the attack.

He said: 'Thank you to all emergency services responding to the incident in Streatham, which the police have now declared as terrorism-related.

'My thoughts are with the injured and all those affected.'

He is expected to return from Chequers to Downing Street this evening to respond to the attack.

Labour leader Jeremy Corbyn posted his thanks to those who have been dealing with the terror-related incident in London on Sunday.

'My thoughts go out to those injured and affected by the incident in Streatham," tweeted the leader of the opposition.

'I would like to thank the police and emergency services for their dedication and quick response.'

An officer crouching down to someone lying on the floor

A large section of the A23 remains cordoned off

Dozens of emergency vehicles are currently lining the area as well as reports of an air ambulance and police helicopter circling above

An armed police officer was standing guard in Streatham after the scene had been fully contained by officers earlier this afternoon

One officer was filmed telling pedestrians that the suspect was wearing a possible suicide vest before directing them away from the scene. Pictured: Pedestrians ducking under the cordon

Mayor of London, Sadiq Khan, wrote a statement which read: 'A man has been shot dead by armed police in Streatham following an incident that is being treated as terrorism-related.

'A number of people are believed to have been stabbed.

'I am in close contact with the Met Commissioner and local representatives and wanted to thank our police, security and emergency services staff for their swift and courageous response.

'They truly are the best of us.

'Terrorists seek to divide us and to destroy our way of life - here in London we will never let them succeed.'

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Labour leadership favourite Sir Keir Starmer added: 'Shocking reports from Streatham. My thoughts are with everyone affected.

'Huge thanks to our emergency services for everything they do to keep us safe.

And Home Secretary Priti Patel wrote: 'I am being kept updated by @metpoliceuk on this afternoon's incident in Streatham, which has been declared terrorist-related.

'My first thoughts are with the victims, our brave police and emergency services and their families.'

Similarly, Health Secretary Matt Hancock wrote: 'All our gratitude goes to the NHS paramedics and emergency services who responded so rapidly to today's incident in Streatham.

'Thinking of everyone involved. We must never be divided by terrorism.'

Jack Odell, 28, from Streatham told MailOnline: 'Police came and knocked on the door and told us to evacuate.

'They just told us to move away from the area. I only saw what was pictured in my tweet of the junction.'

Mr Odell said officers did not say when he could return to his property.

Cars come to a standstill in Streatham after armed police officers stand guard

A police officer outside the Iceland store in Streatham

One police officer securing the area lifted the cordon for a woman to exit the high street following the incident

A police officer stands guard in a car park behind a Boots store near to the scene where a man was shot and killed

Richard Mustonen-Smith, 59, a response pastor for Ascension Trust, has lived in the area all his life.

He said: 'I'm shocked it's happened in Streatham. I've been here all my life. We're always getting accidents down here but not this.

'My grandson was in the Odeon and they got told to go out the back because there was a bomb. They got them to go out of the back of the cinema. They were there to watch a film.

'When it's a member of your family so close to you you don't expect it. You're always worried about your family being on the streets but this is even worse.

'I heard two people got stabbed and apparently one man was shouting Allahu Akbar but people thought he was just a crazy man, so he got away. Apparently he had two rucksacks.'

An unmarked police car pulled up in the middle of the road

Members of the public huddled together as the suspect was laying on the pavement

Police at the scene on Streatham High Road. Metropolitan Police tweeted: 'We believe there are two injured victims. We await updates on their conditions'

A 33-year-old woman who lives near the scene also MailOnline how she was locked in a nearby Odeon for 20 minutes after the attack, before being rushed out a fire exit round the back.

She said officers came in and ordered them to stand well away from the windows.

She continued: 'I heard it and just thought it was a car backfiring. Everyone did.

'I ran into the Odeon just down the road. There were quite a few people in there. Only a few ran inside to start with.'

She said staff shut the doors. 'Everyone just thought it was a car.'

Four police cars and 12 officers were pictured taking control of the scene on High Road in Streatham earlier today. The incident has since been contained

Prime Minister Boris Johnson is expected to return from Chequers to Downing Street this evening to respond to the attack. Pictured: Police swarmed the high street after reports of gunfire

Metropolitan Police tweeted: 'We can confirm that the man shot by police at around 2pm today in #Streatham High Road has been pronounced dead'. Pictured: Streatham High Road

She said another woman locked in the cinema, who had been on the way to Poundland, witnessed the shooting and was shaking with fear.

'She thought it was a gang shooting because the two men were dressed all in black.

'She was really shaking, she was quite distressed and was panicking and all over the place.'

The woman ran upstairs in the cinema before people were let out the back.

She said she sprinted home as police cars 'zoomed around the area and helicopters circled above'.

She had to take a scenic route back home due to the main road being sealed off.

Police cars are seen at the scene surrounding the police cordons. London Ambulance Service were called just before 2pm

Members of the public have been commenting on social media.

Rector Anna Norman-Walker, who works at St Leonard's Church in Streatham, said: 'Situated in the #Streatham Rectory with police tape both sides of us... prayers for our wonderful police who are doing such a remarkable job in a frightening situation.'

One user wrote: 'What the hell is going on in Streatham?!? Helicopters circling above and sirens outside. Twitter saying a man has been shot dead. 'It's a Sunday afternoon and families are everywhere. Very scary.'

Another added: 'Be careful out today I'm London, just seen about two dozen armed police, a man shot and a two stab victims receiving urgent medical care.

'I don't know but I think like I heard 3 gun shot in Streatham.'

A third man said: 'Something major happening in Streatham High Road. Armed police and roads closed off.'

Dozens of emergency vehicles are currently lining the area and a helicopter ambulance landed on Tooting Bec Common a few hundred yards from the scene of the shooting

Two police officers wearing hazmat suits arrived on the scene on Streatham High Road a short time later. The road remains closed as they continue to investigate

Clothing and used medical litter was left discarded on the street in Streatham where a man was shot by police after reports that he stabbed two people

Emma Taylor, from Streatham Hill, told Sun Online: 'I was walking up the high street after going for brunch with some friends and we saw a woman screaming outside a small hardware shop next to Iceland.'

She said the distressed woman, who owns a hardware shop, shouted 'he's just grabbed a knife from my shop and stabbed a lady.'

The 31-year-old said the woman was just five yards in front her being treated by paramedics.

Ms Taylor described how there were armed police everywhere and said the woman being treated was in 'pure shock'.

Streatham High Road, Lambeth, London, has been cordoned off by police after reports of a man shot by police

A car believed to be an armed response car that crashed on the way to the scene as officers investigate the incident

Mr Chawner tweeted to say: 'I had to stay with someone who'd just been #stabbed in #Streatham for 30 minutes before a single ambulance arrived.

'I'm just over one mile from a hospital - I'm not having a go at anyone but that's not right.

'I just hope he made it.'

Speaking to Sky TV later, he said: 'In that moment I did not think it was a terrorist attack, I did not think it was anything out of the ordinary, until I saw the guns...

'My only concern was the poor person in the street.'

Rory Stewart, who is an Independent candidate for Mayor of London in the upcoming 2020 election, responded to Mr Chawner's post.

He wrote: 'So much respect for your courage and presence of mind - remember to get to counselling immediately - at least have a chance to calmly talk it through.

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'All my respect and best wishes.'