The groups are also calling on Iranian authorities to undertake independent judicial reviews of the trials of convicted demonstrators, and want to see Iranian authorities open investigations of allegations of torture made by some of the prisoners.
In July 1999, pro-democracy students clashed with police in cities across Iran after a police crackdown at a student protest on 18 Tir. One student was killed and hundreds of other people were injured in the violence.
(Amnesty International/AP)