London terror attacker PICTURED: Dramatic first pictures of man taken into custody

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London terror attack: An armed policeman points a gun at a man on the ground

An armed policeman has died after he was stabbed and his attacker shot by officers after a major terrorist incident at the Houses of Parliament, which has killed at least four people, including the suspected attacker.

The attacker mowed down several pedestrians as he drove a grey Hyundai i40 across Westminster Bridge before crashing it into railings then running through the gates of the Palace of Westminster and stabbing the officer.

Eyewitnesses said he was shot by police as he approached a second officer clutching his knife.

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Policeman is seen pointing a gun at the man lying on the floor as emergency services rush to help a victim nearby

He left a trail of destruction as paramedics tended to his victims on the bridge and at the gate.

In dramatic images a policeman is seen pointing a gun at a man lying on the floor as emergency services rush to save a victim nearby.

A knife is seen on the ground near the foot of the armed policeman.

Police officers surround the man as he is strip searched on the ground.

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Armed police surround a man on the ground

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Police strip search a man on the ground

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A knife is seen on the ground near the armed policeman

Specialist officers wearing blue gloves surround the man moments before he is taken to hospital.

Later images show the man being rushed onto the back of an ambulance.

At least four people have died after a knifeman mowed down pedestrians on Westminster Bridge then stabbed a policeman in front of Parliament before being shot by armed officers.

London terror attack: What we know so far about the shooting at Parliament in Westminster

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The man is taken into an ambulance as knives are seen on the ground

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The man was seen being taken to hospital

Scotland Yard said four people have died including a policeman and the suspected attacker shot by a police firearms officer. At least 20 people have been injured.

Eyewitnesses described scenes of terror as the attacker was shot several times as he approached a second officer within yards of the Houses of Parliament.

Paramedics fought to save his life and that of his victim on the floor of the cobbled courtyard in front of Parliament with Foreign Office minister Tobias Ellwood among those who rushed to help.

Colleen Anderson, a junior doctor at St Thomas' hospital, said a woman was killed as the attacker drove a grey Hyundai i40 across Westminster Bridge before crashing it into railings then running through the gates of the Palace of Westminster.

London terror attack leaves police officer dead after stabbing

London Terror Attack: LIVE PICTURES Wed, March 22, 2017

Two dead, 12 injured as knifeman mows into crowd in Westminster

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Conservative MP Tobias Ellwood (centre) helps emergency services attend to a police officer outside the Palace of Westminster, London

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Scotland Yard is treating the incident as a terror attack

She also said she treated a police officer in his 30s with a head injury who had been take to King's College hospital.

The attack left a trail of destruction as paramedics tended to victims on the bridge and at the gate.

Scotland Yard is treating the incident as a terror attack.

The bomb squad has been called to Parliament to investigate a suspicious package in the 4×4 that crashed into the perimeter fence.

More to follow…