Muhammad Mazuz has pleaded with Arab authorities to work towards saving their Arab countrymen who are imprisoned in Guantanamo, "because of the abuse and the harsh treatment they receive".
Mazuz told Aljazeera's correspondent in Morocco: "Arab prisoners were abused by stripping them of their clothing; subjecting them to electrical shocks, exposing them to harassment from female investigators; tampering with their sexual organs, and threatening them with rape."
He also described how trained dogs were allowed into holding cells, biting and clawing at the prisoners who were then left to bleed as their wounds slowly became infected.
"Several prisoners had their legs amputated as a result of untreated wounds," he told Aljazeera.
Mazuz and fellow former inmate Ibrahim Binshakrun were among five detainees of Moroccan citizenship released by US authorities to the North African kingdom in early August.
Mazuz reunited with his father
after Guantanamo detention
Mazuz and Binshakrun were released on bail on 28 March.
The other three - Abd Allah Tabarak, Muhammad Uzar and Ridwan Shakkuri - who are due to face terrorism-related charges in the same trial, were freed on bail in December 2004.
The five face charges of "support for a criminal group by transferring money to Moroccans to create a gang that threatens Morocco's interests" and assistance in forging passports.
"The investigation has shown no ties between the Guantanamo five and the Moroccan Islamic Combatant Group," defence lawyer Muhammad Hilal told the court.