
The only pictures of the 52-year-old until now had been of him on a stretcher being attended to by paramedics after he fatally stabbed PC Keith Palmer in the grounds of Parliament.
Masood's birthname was Adrian Russel Ajao and he also went by the name Adrian Elms and a number of other aliases.
Two of the pedestrians died on the bridge and another died in hospital yesterday.
Acting Deputy Commissioner Mark Rowley has appealed for the public’s help in the investigation.
He said: “We named the dead terrorist as Khalid Masood, and as I said, our investigation focuses on understanding his motivation, preparation and his associates.
Met Police
"Whilst there is no evidence of further threats you will understand our determination to find out if he either: Acted totally alone inspired by terrorist propaganda; or, if others have encouraged, supported or directed him.
"At this point I want to appeal specifically to the public.
"We remain keen to hear from anyone who knew Khalid Masood well; understands who his associates were; and can provide us with information about places he has recently visited
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