For almost two weeks, Iran has seen protests over its disputed presidential election, with opposition supporters demanding a rerun of the vote they say was rigged.
A spokesman for Iran's powerful Guardian Council has said there was no fraud in the election, and President Mahmoud Ahmadinejad was clearly re-elected.
However, opposition supporters have said they will continue their protests.
They plan to release thousands of balloons emblazoned with the name 'Neda'.
Neda Agha-Soltan has become a martyr figure since she was shot dead at a protest earlier in the week.
The Iranian security forces have not admitted responsibility for her death, which was captured on film.
Dr Arash Hejazi, who is studying at a university in the south of England, told the BBC's Rachel Harvey that he ran to Neda Agha-Soltan's aid after seeing she had been shot in the chest.
First broadcast 25 June 2009