Libyan authorities have found at least 29 more bodies of migrants in a mass grave in the country’s southeast, a security official told Reuters on Thursday.

The total number of bodies recovered rose to 57 after the prosecutor’s office said on Sunday that authorities had found 28 bodies north of Kufra, a large area in the country’s southeast.

The International Organisation for Migration (IOM) said on Monday that bodies found in two mass graves in Libya showed signs of gunshot wounds.

The main town of Kufra is about 1,700 kilometres from the capital Tripoli.