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The Westminster terror suspect is "not cooperating" with police as officers work to establish exactly what happened at parliament this morning.

Three people were injured after the car collided with cyclists and pedestrians before crashing into safety barriers at around 7.37am.

One woman is still being treated at St Thomas' Hospital for serious but non life threatening injuries.

After crashing into the barriers, the man in his 20s was arrested at gunpoint by armed police on suspicion of terrorism offences.

The assistant police commissioner Neil Basu said the attack "appeared to be deliberate" and that the suspect is refusing to answer their questions.

(Image: itv)

Officers are trying to establish his identity and the reason behind the incident.

The investigation is being led by counter terrorism command and Mr Basu said that based on the details they have at the moment, officers "don't believe this person is known to either MI5 or counter terrorism police".

He said: “Given that this appears to be a deliberate act, the method and this being an iconic site we are treating this as a terrorist incident and it is being led by officers from the counter-terrorism command.

“Officers are searching the vehicle and no other weapons have been found at this time.

“At this early stage of the investigation no other suspects have been identified or reported to police.

“There is no intelligence at this time of further danger to Londoners or the rest of the UK connected to this incident.

(Image: BBC) (Image: BBC)

“Our priority now is to formally identify the suspect and establish his motivation if we can.

“He is not currently co-operating.

“However, as you would expect detectives form the counter-terrorism command are making various other urgent enquiries to ensure there is no outstanding risk to the public."

Video footage captured the moment the speeding car hit cyclists and pedestrians before crashing into safety barriers.

Mr Basu also clarified that the suspect was not being pursued by police at the time.

He said: "I believe it was an ambulance on a completely unrelated call.”

When asked whether the vehicle was deliberately driven at police officers in a targeted attack, Mr Basu replied: “We can’t say that at this time. It certainly appears to be a deliberate attack act but the motivation is we can’t say.

The video shows the silver Ford Fiesta travelling westbound along the Palace of Westminster before it swerved into eastbound traffic.

As an ambulance passes the car on its right-hand side, the vehicle swerves left, crossing oncoming traffic and a pavement before entering a small road and crashing into a security barrier.

Two police officers appear to jump out of the way before the car crashed.

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Police said in a statement: "The Metropolitan Police’s Counter Terrorism Command is investigating an incident in Westminster this morning during which a number of people were injured.

"At 7.37am on Tuesday 14 August, a silver Ford Fiesta collided with a number of cyclists and pedestrians, before crashing into barriers outside the Houses of Parliament.

"The driver of the car, a man in his late 20s, was arrested at the scene by armed officers. He has been taken to a south London police station where he remains in police custody.

"He was arrested on suspicion of terrorist offences.

"There was nobody else in the vehicle, which remains at the scene and is being searched.

"No weapons have been recovered at this stage.

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"A number of people were injured as a result of the collision and they have been taken to hospital.

"At this early stage none of the injuries appear to be life-threatening.

"Officers remain at the scene and cordons are in place to assist the investigation.

"Road closures in the area are likely to remain in place for some time.

"Westminster Tube station is currently closed.

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"At this stage, we are treating this as a terrorist incident and the Met's Counter Terrorism Command is now leading the investigation.

"Anyone with information that could assist with the investigation can call 0800 789 321.

"Anyone who may have footage or images of the incident is asked to send them to police via: www.ukpoliceimageappeal.co.uk.

"The public can also expect to see extra police officers - both armed and unarmed - out on the streets in and around central London.

"The public should remain vigilant and if you see anything suspicious that causes concern, dial 999 immediately."