He allegedly drove through the night from Birmingham to London and toured the areas of Westminster, Whitehall and Tottenham Court Road, the Telegraph said. Counter-terrorism police do not believe there is a risk of further attacks at this stage. The one significant weak spot was the main vehicle gates - as became apparent in March 2017's one-man attack.
The driver, a man in his late 20's, was arrested at the scene on suspicion of terrorist offenses.
The driver of a auto injured three people before crashing into barricades near Parliament.
The suspect has not been formally identified, and Basu said he believes the man is not known to the security services.
The suspect arrested after following yesterday's Westminster terror attack has been named as Salih Khater.
The auto swerved across oncoming traffic in Parliament Square, hitting cyclists and pedestrians before crashing into security barriers.
Britain's counter-terrorism police chief said that given the iconic location and method used, the incident appeared to be a "deliberate act" and that it was therefore being treated as a terrorist incident.
The auto is said to have been driven at speed, and to have lifted off the ground when it hit the barriers. Officers remain at the scene. Basu confirmed that two people were sent to the hospital, but one man was discharged "and one woman remains in hospital being treated for serious but thankfully, non-life threatening injuries". Reports indicate at least some of the injured were cyclists.
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-The whole of Parliament Square has been cordoned off and officers are asking the public to move away from the scene.
In March a year ago, Khalid Masood, 52, killed four people on nearby Westminster Bridge and stabbed to death an unarmed police officer in the grounds of Parliament before being shot dead.
The older brother of the Westminster terror suspect has said he is "100 per cent sure he is innocent".
The cafe-goer, who would only give his name as Adam, said: "I am still in shock".
"I can't see him doing anything stupid". He was shot dead at the scene.
Armed police swooped into the area after the incident was reported at 7.37 am local time, arresting the auto driver and cordoning off streets surrounding the heart of Britain's government.
Prime Minister Theresa May tweeted: "My thoughts are with those injured in the incident in Westminster and my thanks to the emergency services for their immediate and courageous response".