Human traffickers have benefited from a decade of instability in Libya, with rights groups documenting widespread abuse.

Some of the bodies of migrants found in two mass graves in Libya bore gunshot wounds, the International Organization for Migration said on Monday, adding that one of the sites is thought to contain up to 70 bodies.

Libya authorities uncovered nearly 50 bodies this week from two mass graves in the country’s southeastern desert in the latest tragedy involving people seeking to reach Europe through the chaos-stricken North African country.

The bodies of at least 28 migrants have been recovered from a mass grave in a desert in south-east Libya, the country's attorney general said.The grave was discovered north of Kufra, just days after another mass grave with 19 bodies was found on a farm in the same city.

Libya's security authorities recovered at least 28 bodies of migrants from a mass grave in the desert in southeast Libya, the country's attorney general said on its Facebook page on Sunday.

The International Organization for Migration (IOM) has expressed shock and concern at the discovery of two mass graves in Libya containing the bodies of dozens of migrants, some with gunshot wounds. Nineteen bodies were discovered in Jakharrah (around 400 km south of Benghazi),