Salih Khater, a Sudan born British citizen was been arrested on suspicion of ramming a car into pedestrians and cyclists before crashing into security barriers outside the Houses of Parliament.
Mr. Khater is 29 years old.
The man has been identified by a European security source, Reuters reports. It added he was not known to security services before Tuesday.
As the UK national remained in police custody, details have started to emerge about the suspect, who lived in a small flat in Birmingham and described himself as a shop manager.
He is believed to have roamed through the night to stake out Westminster for more than an hour-and-a-half before mowing down cyclists in the heart of Westminster on Tuesday morning.
