Iranian police have clashed with mourners at a memorial service for people killed in post-election violence.
Crowds had gathered to mark the 40th day after the death of Neda Agha Soltan, 27, who was shot dead on 20 June as she watched protests against the country's disputed presidential poll.
Opposition leader Mir Hossein Mousavi tried to join the mourners but police forced him to leave, witnesses said.
The BBC's correspondent Jon Leyne was expelled in the days following the election and has been following events from London.
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