Egypt's acting Prosecutor-General Ali Omran ordered on Wednesday the release of 77 detainees who suffer critical medical conditions.
The released had been jailed pending investigations into accusations they were involved in illegal protesting, Ahram Arabic News website reported.
In a statement issued Wednesday, the prosecutor's office said that the released detainees were arrested during various clashes in Giza governorate between security forces and supporters of ousted Islamist president Mohamed Morsi.
The prosecution has not provided the names of the released prisoners.
The order for the release came following recommendations made to the prosecutor-general's office by aides.
Last month the acting prosecutor also released 125 detainees – including prisoners with critical medical conditions and students – who were facing similar accusations of breaking the 2013 Protest Law.