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, officials said Sunday, in the latest tragedy involving people seeking to reach Europe through the chaos-stricken North African country.

No fewer than 28 bodies of migrants have been discovered next to a detention facility in the desert in southern Libya. The Libyan Attorney General’s Office in a statement on Sunday said a mass grave was discovered in the city of Kufra,