Egypt's top prosecutor has ordered the release of nearly two dozen supporters of ousted Islamist president Mohamed Morsi  in consideration of the detainees' health problems, Al-Ahram Arabic news website reported on Tuesday.
The 21 Islamist protesters had been arrested when security forces dispersed a pro-Morsi sit-in in Nahda Square in Giza  last August.
Prosecutor General Hisham Barakat did not provide any information on Tuesday regarding the detainees' health concerns.
Three other pro-Morsi students  were also released on Tuesday, with prosecutors citing a concern for the students' academic future.
The students had previously been charged with rioting, attacking security forces, challenging authorities and setting fire to a university building.
Interim authorities have cracked down hard on Muslim Brotherhood  members and their empathisers since Morsi's ouster in July, resulting in thousands detained and the group's top leadership standing trial for a variety of charges.