The Final Report of the Panel of Experts on Libya established pursuant to UN Security Council resolution 1973 (2011) also addresses the manner in which many migrant detention centres are operated, controlled, and the conditions within. The report discusses links between armed groups and criminal groups in regard to migrant smuggling and the control of migrant detention centres by armed groups and criminal groups. Abuses, which have been well documented previously by many other reports, include deprivation of food and water, lack of access to sanitation, beatings, forced labour, rapes, and other forms of sexual violence.

The article contains excerpts from the Final Report which illustrate this.

https://migrantsatsea.org/2017/06/15/un-report-also-documents-grave-human-rights-violations-in-libyan-migrant-detention-centres/