Sgt. La David Johnson, one of the four American soldiers killed in the ambush in Niger last month, may have been captured and then executed, a report published Friday evening said.

Adamou Boubacar, a farmer and trader from the Nigerien town of Tongo Tongo, said children who were tending cattle notified him that they had found the Johnson’s remains on Oct. 6, just two days after the attack, according to the Washington Post.