The body of Sgt. La David Johnson, one of four U.S. soldiers killed in an ambush by Islamist militants in Niger last month, was found with his arms tied and a gaping wound at the back of his head, according to two villagers, suggesting that he may have been captured and then executed…

When Boubacar went to the location, a bushy area roughly a mile from the ambush site, he saw Johnson’s body lying face down, he said. The back of his head had been smashed by something, possibly a bullet, said Boubacar. The soldier’s wrists were bound with rope, he said, raising the possibility that the militants — whom the Pentagon suspects were affiliated with the Islamic State — seized Johnson during the firefight and held him captive.