police
Crowds applauded as the hearse passed by.
He gave his life protecting the Houses of Parliament.
'Could be being hidden somewhere.'
'I suddenly realised after he had gone that I had no way of tracing him.'
17-year-old Reker Ahmed suffered a fractured skull.
Khalid Masood's attack killed four innocent people.
'Vicious, unprovoked attack'.
It took almost a year to find out who he was.
Around 200 revellers attended the underground party.
The man's death is not being treated as suspicious.