WARNING: GRAPHIC CONTENT

Video shows terrorist speeding across Westminster Bridge in 4x4, ploughing into crowds on pavement

Three members of the public have died. The driver then stabbed a police officer to death, and was shot dead himself

Police say they believe they know the identity of the killer, but have not revealed who he is

One woman is seen plunging into the River Thames below. Incredibly she was rescued alive

Another video, taken moments after, shows injured people being treated by passers-by

Police say around 40 people were injured by the car, which crashed into a fence below Big Ben

Woman who took video is heard asking 'What coward is doing this? Oh lord'

Horrifying footage shows the moment a woman plunged into the River Thames as a car ploughs onto the pavement in a terror attack in the heart of London.

Incredibly she was rescued alive from the river following the atrocity, which saw three members of the public killed on the bridge before the driver murdered a police officer in a knife attack.

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The unarmed officer who died has been named by Scotland Yard as 48-year-old father Keith Palmer.

The attacker was shot dead by officers outside the Houses of Parliament.

A patient believed to be the woman who plunged into the River Thames during the horrific terror attack is treated in Westminster

It is not known whether the woman fell or jumped, but initial reports from the scene suggested she had leaped into the water to escape the 4x4 which killed three people before crashing into railings outside Big Ben.

The car is seen speeding along Westminster Bridge at 2.40pm. Police have said around 40 people were injured before the car came to a halt.

The seriously injured include two French pupils, thought to be 15 or 16 years old, as well as tourists from South Korea and Romania.

A third pupil, from St Joseph High School in the Brittany seaside town of Concarneau, was treated at the scene after being hit by the same car. Their families were flown to London last night in a move announced by President Francois Hollande.

The Yonhap news agency in South Korea has said the seriously injured tourist was a 67-year-old woman whose surname is Park.

She suffered a head injury after being shoved by people fleeing the scene, and needed surgery at St Mary's Hospital in London, according to reports.

A man with a serious head injury is seen being treated by a woman in the road on Westminster Bridge

In another video taken moments after the attack, casualties are shown being treated by passers-by on the landmark bridge, which is a popular spot for tourists.

The video was taken by a woman who can be heard repeatedly stating 'Oh my god', before asking aloud: 'What coward is doing this? Oh lord.'

Metropolitan Police counterterrorism chief Mark Rowley said police believed there was only one attacker, but added it would be 'foolish to be overconfident early on'.

Islamic extremism was suspected to be the motivation for the attack, Rowley said, adding that authorities believe they know the assailant's identity but would not reveal it while the investigation was ongoing.

Groups on the bridge gathered around the injured to offer first aid in the immediate aftermath of the attack

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The footage shows a woman lying in the road beneath a bus. She died as a result of her injuries, it has been confirmed.

Another victim, a man, is seen being treated with what looks like a serious head injury by a woman, blood pouring from his forehead.

The woman who took the footage is heard asking: 'Do you know what happened?'

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A passer-by responded: 'One car', but did not elaborate. Debris from the vehicle, a Hyundai 4x4, can be seen in the road and on the pavement approaching the Houses of Parliament.

As the woman walks toward the Palace of Westminster, four people are seen lying on the pavement surrounded by members of the public giving them first aid. Sirens are heard in the distance as emergency services scrambled to the scene.

The car mounted the pavement close to the Houses of Parliament and Big Ben. After crashing the man, brandishing an eight inch kitchen knife, jumped out and ran to Parliament Square as terrified members of the public ran for their lives.

After attacking PC Palmer, the terrorist was shot at least two times in the chest.

The car mounted the pavement close to the Houses of Parliament and Big Ben, with around 20 people injured and at least one killed

People who were on the bridge when the 4x4 drove into crowds gave first aid as they waited for emergency services to arrive

A man is treated in the road after the 4x4 drove into crowds on Westminster Bridge outside the Houses of Parliament

Passers-by crowded round the injured to give them first aid after the 4x4 drove along the pavement on Westminster Bridge

'HE LEFT FOR WORK TODAY EXPECTING TO RETURN HOME AT THE END OF HIS SHIFT': TRIBUTES PAID TO HERO POLICE OFFICER KILLED BY TERRORIST PC Keith Palmer was stabbed to death by the crazed attacker PC Keith Palmer, who was stabbed to death by the crazed attacker, was a member of the Parliamentary Diplomatic Protection Command and had served on the force for 15 years. Paying tribute to the officer tonight, Scotland Yard's top anti-terror officer Mark Rowley said: 'He [PC Palmer] was someone who left for work today expecting to return home at the end of his shift, and he had every right to expect that would happen.' London Mayor Sadiq Khan said in a statement: 'Tonight we have learned that the courageous police officer who was killed while protecting our city was PC Keith Palmer. 'He was 48 and a husband and father. 'Keith Palmer was killed while bravely doing his duty - protecting our city and the heart of our democracy from those who want to destroy our way of life. 'My heart goes out to his family, friends and colleagues. 'He personifies the brave men and women of our police and emergency services who work around the clock to keep us safe - tonight all Londoners are grateful to them.' Police forces around the country also paid tribute to the officer. A statement by Nottinghamshire Police said: 'RIP Metropolitan Police officer - PC Keith Palmer. Father, husband, police officer of 15-years, who died today protecting the public. When many ran from danger, you went towards it.' More tributes have poured in via social media for the police officer, with many describing him as a 'hero'. Others have sent their best wishes and condolences to his family and praised PC Palmer for his dedication to keeping the public safe. Some said they would launch a petition to have the police office posthumously awarded the George Medal, a civilian honour given out for bravery.

As the woman taking the footage approaches Westminster Palace, an armed officer blocks her path and tells her to move away.

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The man drove a year-old Hyundai Tucson - worth up to £32,000 and registered in the affluent Essex city of Chelmsford - down Westminster Bridge at 'high speed' yesterday.

Several of those injured were critically wounded, medics have revealed.

The attacker, who was shot at least twice by armed officers guarding the building, died after he was taken to hospital

Scotland Yard said the attack, which comes a year to the day after the atrocities in Brussels is being treated 'as a terrorist incident'

'FORCES OF EVIL WILL NEVER DRIVE US APART' SAYS THERESA MAY FOLLOWING LONDON TERROR ATTACK Prime Minister Theresa May tonight vowed Britain would 'never give in to terror' and 'defeat hate and evil' after she blasted the 'sick and depraved' attack in Westminster Prime Minister Theresa May has vowed the UK will 'not give in to terror' following a 'sick and depraved' terror attack in London yesterday in which three people and a terrorist were killed. Speaking outside 10 Downing Street after chairing a meeting of the Government's Cobra emergencies committee, Mrs May paid tribute to the 'exceptional men and women' of the police force who responded to the attack. She confirmed that a 'lone wolf' attacker drove a car into pedestrians walking on Westminster Bridge, killing two of them, before running with a knife through the front gates of the Palace of Westminster, where he killed a police officer before being shot dead. Mrs May said that any attempt to defeat the values that Parliament stands for was 'doomed to failure'. And she vowed: 'We will all move forward together, never giving in to terror and never allowing the voices of hate and evil to drive us apart.' The UK's terror threat level would remain at 'severe', Mrs May said. She praised the bravery of the police officers 'who keep us and our democratic institutions safe'. 'Our thoughts and prayers go out to all who have been affected, to the victims themselves and to their families and friends, who waved their loved ones off but will not now be welcoming them home. 'For those of us who were in Parliament at the time of this attack, these events provide a particular reminder of the exceptional bravery of our police and security services who risk their lives to keep us safe. 'Once again today, these exceptional men and women ran towards the danger, even as they encouraged others to move the other way.'

The policeman died at the scene. The attacker died after he was taken to hospital. It is currently believed he was the only 'lone wolf' attacker.

Nearby hospitals including St Thomas’ and Chelsea and Westminster treated the victims, with some doctors running to the bridge to help, and an air ambulance landing in Parliament Square.

It was the worst attack in the UK since the London transport network atrocities of July 2005, which cost 52 lives.

The car mounted the pavement in Westminster Bridge before crashing into railings outside the Houses of Parliament

Armed police outside the Houses of Parliament, where a terrorist was shot dead after driving into crowds on Westminster Bridge before attacking a police officer, who later died

'I TRIED TO SAVE HIM... HE'D LOST TOO MUCH BLOOD': MP WHOSE BROTHER DIED IN BALI ATTACK TELLS OF HIS BATTLE TO SAVE STRICKEN POLICEMAN Tory MP Tobias Ellwood battled to save the life of the policeman stabbed outside Parliament Tory MP Tobias Ellwood battled to save the life of a policeman stabbed outside Parliament yesterday but said the officer had 'lost too much blood' after the attack. The Bournemouth East MP, 50, gave mouth-to-mouth to the officer and put pressure on his wounds to stop the blood flow after he was stabbed by an assailant just inside the gates of the Parliamentary estate. Mr Ellwood, a former army officer, was then pictured with blood on his face after the emergency services arrived and took over medical assistance. The attacker is described as an 'Asian' man aged in his 40s. He is said to have 'plunged a seven inch knife' into the officer. Mr Ellwood's brother Jonathan was killed aged 39 in the 2002 Bali bombings by a Islamic militant group Jemaah Islamiyah. Speaking just hours after the attack which has so far left four dead, including the attacker, Mr Ellwood, formerly a Captain in the Royal Green Jackets, said the attack was a 'huge tragedy'. He said: 'I am a witness, I was the last one on the scene before he died so I am not allowed to say anything. Number 10 has been in touch so I'll get into trouble. 'It is now murder, I was on the scene and as soon as I realised what was going on I headed towards it. It is a huge tragedy, it really is. 'I tried to stem the flow of blood and give mouth to mouth while waiting for the medics to arrive but I think he had lost too much blood. He had multiple wounds, under the arm and in the back. 'As I understand it the attacker has also died. I'm not allowed to say anything, I'll get into trouble. It's very sad.' A former soldier, Mr Ellwood remained with the victim for some time before an air ambulance arrived. Conservative MP Tobias Ellwood (centre) helps emergency services attend to a police officer outside the Palace of Westminster after he was attacked by a terrorist outside Parliament

Witness Jayne Wilkinson said: 'We were taking photos of Big Ben and we saw all the people running towards us, and then there was an Asian guy in about his 40s carrying a knife about seven or eight inches long.

'And then there were three shots fired, and then we crossed the road and looked over. The man was on the floor with blood.

'He had a lightweight jacket on, dark trousers and a shirt. He was running through those gates, towards Parliament, and the police were chasing him.'

Her partner David Turner added: 'There was a stampede of people running out. You saw the people and you thought 'what the hell is going on'.'

Foreign Office minister Tobias Ellwood was among those who rushed to help the policeman who had been stabbed.

Mr Ellwood, who lost his brother in the Bali bombing, could be seen pumping the officer's chest then standing above him, his hands and face smeared with blood.

Three people were killed and a terrorist was shot dead outside the Houses of Parliament this afternoon

A row of ambulances was called to Westminster Bridge after a car drove into crowds, and a terrorist attacked a police officer, who died at the scene

Frazer Clarke, 25, from Burton-on-Trent, said: 'We heard a loud bang and screaming and then I noticed some smoke. I thought it was a car crash.

'I looked towards the front gate and people were running, a police officer and a fellow coming to the gate with two knives.

'He was stabbing the police officer with the knives. He was wearing black tracksuit bottoms, a black of grey top and what looked like work boots. The police officer was stumbling and fell on the floor'

Pat McCormack, 21, from Washington in Tyne-on-Wear added: 'I saw him stabbing the officer in the back of the head and the back of the neck. He was running away but then he collapsed.'

Steve Voake, 55, was walking across the Westminster Bridge and saw at least two bodies lying on the road and one in the water.

'I saw a trainer lying in the road and when I looked more closely I saw that there were a couple of bodies the other side of the road,' he told the Press Association.

'And when I looked over the side there was another body lying in the water with blood all around it.'

Roads were closed off around the Houses of Parliament after the attack this afternoon, which claimed the lives of three people, including a police officer. A terrorist was shot dead

A woman lies injured beneath a bus following the terror attack in Westminster, which claimed the lives of three members of the public and a police officer before the attacker was shot dead

Flowers were laid at the scene of the terror attack close to the Houses of Parliament yesterday afternoon

Three police officers on their way back from a commendation ceremony when they were knocked down on Westminster Bridge.

The attacker also targeted 13 students from Edge Hill University on a politics trip to London.

The university said four were hurt. One had head injuries, another wrist injuries, while two were walking wounded.

Travis Frain, from Darwen, Lancashire, the Chairman of Conservative Future’s West Lancashire branch, suffered a cracked rib and injuries to his hand.

His mother said he was being treated in hospital but was in ‘good spirits’ and in a stable condition, according to the university.

Mr Frain has previously volunteered for Darwen and Rossendale MP Tory Jake Berry.

LONDON ON LOCKDOWN: POLICE ISSUE LIST OF NO GO AREAS AFTER TERROR ATTACK ON WESTMINSTER London is on lockdown as people were warned to stay away from no go zones after at least four people were killed in an attack on Westminster. Westminster Tube station has been closed following the attack, in which a policeman was stabbed to death and at least twenty people were injured when a car mounted the pavement on Westminster Bridge. A huge area around the palace has now been cordoned off, including the bridge, as police remain on high alert in fear of any subsequent attacks on what it the heart of Britain's political establishment. Police are asking people to avoid Parliament Square, Whitehall, Westminster Bridge, Lambeth Bridge, Victoria Street up to the junction with Broadway and the Victoria Embankment up to Embankment tube Police have warned people to expect armed guards at Tube stations and a heavy police presence on the streets, and the Army is now poised to descend upon London amid security fears. Police are asking people to avoid Parliament Square, Whitehall, Westminster Bridge, Lambeth Bridge, Victoria Street up to the junction with Broadway and the Victoria Embankment up to Embankment Tube. The Thames has been closed from Vauxhall to Embankment 'as part of the security response', after a member of the public, believed to have been hit by the car, was recovered from the water near Westminster Bridge. The terrorist was shot dead by police after he attacked an officer, who died at the scene outside the Houses of Parliament this afternoon The closure of the river, along with roads in the centre and Westminster, used by thousands of people visiting and working in Whitehall every day, caused temporary chaos in central London. Dozens of people were stranded in the air at the top of the London Eye, which stopped amid the carnage in Westminster. The huge security increase comes just days after Britain banned electronic devices such as laptops from the cabins of UK-bound planes from six middle eastern nations amid fears they could be used to blow up planes. The death toll so far stands at four, including the attacker, who was shot after stabbing a police officer with a knife. The officer suffered fatal injuries and has also died, police have now confirmed.

Fellow student Owen Lambert, 18, from Morecambe, Lancashire, needed stitches to a head wound.

A Romanian couple on holiday are also thought to be among the injured. Andrei, an engineer in his mid-20s, and Andreea, his girlfriend, were caught up in the attack.

Retired surveyor Patrick Tracey, said he believed Andreea had been severely injured while Andrei had suffered an injury to his leg after being hit by the car.

Mr Tracey, 64, from Derby, said he arranged to meet the pair by the London Eye and Andrei had called him to tell him he had lost Andrea.

A message on the Romanian Embassy’s Facebook said two of the country’s citizens had been injured and taken to local hospitals.

Armed police were called to Westminster after the deadly attack, which has seen three people, including a police officer, killed, and a terrorist shot dead

Witnesses described the moment the car ploughed into the crowds on the bridge.

Steve Voake, 55, said: ‘I saw a trainer lying in the road and when I looked more closely I saw that there were a couple of bodies the other side of the road. When I looked over the side there was another body lying in the water with blood all around it.’

Radoslaw Sikorski, a senior fellow at Harvard Centre for European Studies, said he saw at least five people lying on the ground after being ‘mown down’ by a car.

‘I heard what I thought what I thought was just a collision and then I looked through the window of the taxi and someone down, obviously in great distress,’ he told the BBC.

‘Then I saw a second person down, and I started filming, then I saw three more people down, one of them bleeding profusely.’

TERROR STRIKES IN LONDON: HOW THE ATTACK UNFOLDED OUTSIDE THE HOUSES OF PARLIAMENT Police cars outside the Houses of Parliament, where three people and a terrorist have died 2.40pm: An attacker mows down several pedestrians as he drives a Hyundai i40 across Westminster Bridge before crashing it into railings then running through the gates of the Palace of Westminster and stabbing a police officer 2.41pm: Metropolitan Police and London Ambulance Service are called to a major incident 3.35pm: Police say the attack is being treated ‘as a terrorist incident until we know otherwise’ 4.10pm: Junior doctor at St Thomas' Hospital says one woman has died and a number of others have been hurt - including some with ‘catastrophic’ injuries 4.45pm: Paramedics confirm they have treated at least ten patients on Westminster Bridge 4.49pm: Police Commander BJ Harrington says there were ‘a number of casualties’ in the attack ‘including police officers’. 4.51pm: Downing Street spokesman says Prime Minister Theresa May will chair a meeting of the Government's emergency Cobra committee later 5.40pm: Sources reveal the police officer stabbed at Parliament has died 6.01pm: Police say four people were killed in the attack, including the police officer and a man believed to be the attacker 6.56pm: Home Secretary Amber Rudd says the Government's top priority following the attack is ‘the security of its people’

A visit by the Queen to the new headquarters of the Metropolitan Police, scheduled for tomorrow, has been postponed.

A Buckingham Palace spokesman said: 'In light of today's events the decision has been taken to postpone the Queen's engagement to New Scotland Yard tomorrow.

'The visit will be rearranged for a later date.'

The Queen was due to officially open the new building on Victoria Embankment on Thursday, accompanied by the Duke of Edinburgh.

Security around the Queen and the rest of the Royal Family was dramatically stepped up following the attack. The gates to Buckingham Palace – where the Monarch was in residence - were closed and armed guards took up positions.

UK security services have foiled 13 potential attacks in less than four years. Counter-terrorism units are running more than 500 investigations at any time.

In the early hours of this morning, South Korea's Foreign Ministry said five South Koreans in their 50s and 60s were among the 40 people injured.

The ministry says the five were hurt when they were caught up in a stampede of people trying to escape the attack.

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It says four of the South Koreans suffered broken bones and other injuries and a woman in her late 60s needed an operation to treat a head injury.