CAIRO — Libya authorities have uncovered nearly 50 bodies from two mass graves in the country’s southeastern desert, officials said Sunday, in the latest tragedy involving people seeking to reach Europe through the chaos-stricken North African country.

The first mass grave with 19 bodies was found Friday in a farm in the southeastern city of Kufra, the security directorate said in a statement, adding that authorities took them for autopsy.

Authorities posted images on its Facebook page showing police officers and medics digging in the sand and recovering dead bodies that were wrapped in blankets.

The al-Abreen charity, which helps migrants in eastern and southern Libya, said that some were apparently shot and killed before being buried.

A separate mass grave, with at least 30 bodies, was also found in Kufra after raiding a human trafficking center, according to Mohamed al-Fadeil, head of the security chamber in Kufra. Survivors said nearly 70 people were buried in the grave, he added. Authorities were still searching the area.

Later on Sunday, authorities said they freed 76 migrants from the trafficking center, and arrested three people — a Libyan and two foreigners — on suspicion of detaining and torturing migrants. Prosecutors ordered the suspects to remain in detention pending investigation.

Migrants’ mass graves are not uncommon in Libya. Last year, authorities unearthed the bodies of at least 65 migrants in the Shuayrif region.