As we previously noted, however, the British have already announced that he had been previously investigated for extremism and was known to MI-5.
The man police believe to be responsible for the terrorist attack in Westminster has been formally identified as Khalid Masood, Scotland Yard says.
Masood, aged 52, was born in Kent and detectives believe he was most recently living in the West Midlands.
Masood was not the subject of any current investigations and there was no prior intelligence about his intent to mount a terrorist attack, police say.
However, he was known to the police and had a range of previous convictions for assaults, including GBH, possession of offensive weapons and public order offences.
He has not been convicted of any terrorism offences.