Watching the armed officers remove the man from the auto wreck, cuff him and arrest him - there is a calmness and professionalism there that you don't see with armed police in some other countries.
Police are treating an attack on the Houses of Parliament as a "terrorist incident", they have confirmed.
London's Metropolitan Police say that the Counter-Terrorism Command is leading the investigation.
Several witnesses told Sky News they thought the crash appeared to be deliberate.
Jackie Laidley from London, works as a manager in the Cabinet office, and told CNN she couldn't reach her place of work due to police cordons. The Westminster tube station was closed, as the police threw a security cordon around the area.
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"The driver of the Fiesta, who was alone in the vehicle, was arrested at the scene", Basu said.
Eyewitnesses said the auto was travelling at high speed when it hit several pedestrians and cyclists, then crashed into barriers outside the Houses of Parliament.
Armed officers police dogs have been stationed around Parliament Square.
In March 2017, Khalid Masood killed four people on Westminster Bridge just outside the parliament building, before going on to stab an unarmed police officer to death in the parliament grounds. The buildings would be largely empty as Members of Parliament are on their summer break. So I don't know why someone would drive into the barrier.
The Palace of Westminster, where Parliament convenes, bolstered security around the buildings in March 2017, after Khalid Masood drove his vehicle into crowds along Westminster Bridge, killing four people.
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He said: "I heard lots of screams and turned round".
It was the first of five attacks on Britain past year which police blamed on terrorism, three of which involved vehicles being used as a weapon.
The man was arrested on suspicion of terrorist offences.
London police say that a auto has crashed into barriers outside the Houses of Parliament and that there are a number of injured. I turned around and I saw a silver vehicle driving from the crossing - very fast and close to the railings, maybe even on the pavement.
Masood abandoned his auto then stabbed and killed unarmed Pc Keith Palmer before he was shot by armed police in a courtyard outside Parliament.
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Britain is on its second-highest threat level of "severe", meaning an attack is considered highly likely and the authorities say a dozen Islamist plots had been foiled since Masood's attack in Westminster a year ago.
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