Having discovered Tamer's name among those of 68 men on the morgue registry, he informed Malek Tamer, who then visited the morgue with his camera.
Tamer Tawfiq Tamer's death certificate said he had died at Al-Fayoum prison on February 3 from "suspicion of suffocation and an acute blood pressure drop".
Malek Tamer described his brother's body as being blue from his head to the lower chest, and said bruises and coagulated blood were clearly visible on his head, nose and eyes.
Reda Ibrahim Eldesouky's death certificate said he had also died on February 3 but gave no reason for his death, stating only: "Forensically examined and case under study."
Mohamed Ibrahim Eldesouky said he saw similar wounds on his brother's body as well as burn marks.
The Egyptian authorities have not issued medical or forensic examination reports for either prisoner.
Malek Tamer and Mohamed Ibrahim Eldesouky have yet to receive any response from the office of Cairo's Public Prosecutor after submitting the video footage and a complaint with support from the Egyptian Center for Development and Human Rights.
About 21,600 prisoners are reported to have been let out or to have escaped from Egypt's prisons in unclear circumstances after the Ministry of Interior, responsible for running prisons, quit office on January 28 following that Friday's "Day of Anger' protests.
More than half of them were re-arrested or later handed themselves in to the authorities.
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