France, Jan. 16 -- The sources, speaking on condition of anonymity, said authorities raided a farm near the town of Ajdabiya after receiving ​a report of migrants from sub-Saharan Africa being held there.

"We found migrants - men, women and children - bearing signs of torture. They were taken to a hospital where they reported that other migrants had been with them and ​then disappeared," one of the security sources told Reuters news agency on Thursday.

The mass grave was discovered some ​10km south-east of Ajdabiya, which is around 160km from Benghazi - the second largest city in the North African country and which is under the control of forces loyal to Libya's army strongmanKhalifa Haftar.

The Internal Security Agen...