Nubians complain they are subjected to discrimination by Egyptian state authorities because of their dark skin tones and indigenous language.
They say that authorities see them as a security threat and are mindful of any sign of secessionist sentiments among their ranks.
A constitution adopted in 2014 gives the government ten years to resettle the Nubians in dry parts of their ancestral lands, but they complain that no steps have yet been taken to achieve this goal.
Nubian communities were originally evicted from their ancestral lands in the 1960s to make way for a lake behind the High Dam on the Nile.
The evacuation of Nubians in the 1960s was the third in southern Egypt since the early 20th century. The other two were also because of dam construction on the Nile.
Allegations about the widespread use of torture in Egyptian jails have been frequent, from international bodies, human rights groups and former detainees.