According to the human rights organization Amnesty International, migrants are still exposed to "appalling crimes" in Libya.
There is new evidence of "harrowing assaults, including sexual violence, against men, women and children," said a report released on Thursday.
Libya is an important transit country for migrants and refugees from Africa and the Middle East who want to reach Europe via the Mediterranean.
If the EU-backed Libyan coast guard picks up the people at sea, they are taken back to internment camps in the North African crisis country.
Human rights activists repeatedly criticize the conditions in the centers.
The migrants are arbitrarily detained in Libya and are "systematically subjected to torture, sexual violence, forced labor and other forms of exploitation," said Diana Eltahawy, Amnesty Regional Director for the Middle East and North Africa.
At the end of 2020, the Libyan authorities "legitimized" the mistreatment of migrants by taking over two militia-run internment camps, the report said.
Hundreds of refugees and migrants have forcibly disappeared from these camps in recent years.
Amnesty reported, citing testimony from survivors, that women in the camps were exposed to sexual violence by guards "in exchange for their release or for essential things like clean water".
The human rights organization condemned "the continuing complicity of European states" with Libya.
The EU's cooperation with Libya on migration and border protection must be suspended.
According to the International Organization for Migration (IOM), nearly 900 migrants died while crossing the Mediterranean this year.
According to the UNHCR refugee agency, the Libyan Coast Guard returned more than 13,000 people to Libya between January and June this year - more than in all of 2020.
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