Libyan authorities have found 12 bodies from four more unmarked graves in the city of Tarhouna.
These bodies adds to the scores of corpses already discovered since the area was recaptured in June by the Government of National Accord - the GNA.
Tarhouna had for years been controlled by a militia known as the Kaniyat, run by the local Kani family.
They fought alongside Khalifa Haftar's eastern-based Libyan National Army.
When Turkish support helped the internationally recognized GNA take back Tarhouna in a sudden advance in June, its fighters found a hospital piled with bodies and unmarked graves containing missing people.
The GNA has issued arrest warrants for Kaniyat leaders who are now believed to be in eastern Libya.
Investigators have been working to identify the bodies.
Some of the bodies show the marks of violence, including a smashed skull and dismembered limbs, according to a missing persons bureau official.