Four people and the attacker, Khalid Masood, died as he drove a car at high speed down the bridge before stabbing a Scotland Yard officer to death at the gates of Parliament.
Police officers and hundreds of members of the Ahmadiyya Muslim Youth Association were among those standing together on Westminster Bridge. The Ahmadiyya youths were wearing T-shirts printed with the message: 'I am a Muslim, ask me anything.'
Similar events were staged in Sheffield, Birmingham, Leeds, Leicester and Manchester.
Inquests into the victims' deaths were opened and adjourned at Westminster Coroner's Court earlier today. Senior coroner Dr Fiona Wilcox said it was a tragic incident.
Senior investigating officer Supt John Crossley said Masood was armed with two knives and caused grave wounds when he attacked police constable Keith Palmer.
The inquest into Masood's death will be opened and adjourned tomorrow.
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