I should warn you that the video footage below, depicting the death of a young Iranian woman at a demonstration in Iran is very, very distressing -I could not stop crying when watching it.
The young woman in the clip, Neda, was shot dead while being caught up a protest with a companion in Tehran on Saturday. A Facebook group created to mourn her calls her "The Angel of Iran". Others called her "Iran's Joan of Arc". Thousands of people inside and outside Iran have written online tributes to the woman, many condemning the government and praising her as a martyr.
One message on Twitter said: "Neda is everyone's sister, everyone's daughter, everyone's voice for freedom." Neda - the name means "the call" or "the voice" - died during protests over the re-election of hard-line President Mahmoud Ahmadinejad on June 12.