Miami native, Sgt. La David Johnson was allegedly found with his hands tied.

According to reports, officials are investigating local eyewitness reports that one of the soldiers killed in an ISIS-linked ambush in Niger last month, Sgt. La David Johnson, was found with his hands tied.

A joint U.S. Africa Command and Niger military investigation team returned to Tongo Tongo, the village near where the attack took place, on Sunday. According to US Africa Command, investigators interviewed local villagers, physically examined multiple areas of interest, and retraced actions before, during and after the ambush.

The visit is said would help investigators gather information and determine facts related to the attack.

What happened to Johnson and how he became separated from the rest of the Green Beret-led team after it was attacked is one of the key mysteries surrounding the incident.

Johnson was found nearly a mile away from the central scene of the ambush in Niger that killed him and three other U.S .soldiers.