TARHUNA, Libya—In August, Hakim Naama heard the news he had feared since his brother, Abu Bakr, vanished while driving home one night in 2019.
DNA testing had identified him as one of 228 bodies unearthed by Libyan authorities from the fields around Tarhuna, a small town in western Libya south of the capital, Tripoli. He had been blindfolded and shot several times in the back and face, according to Mr. Hakim and a United Nations human-rights panel.