The SPLA officer says a passenger coming from Yirol to Awiel injures himself when he arrived in Tonj.
Colonel Alfred Tokriic Mapouron explains that Mareec Lual Deng fire three bullets at his head by mistake and broke his mouth into two, Radio Don Bosco reports.
He reveals that the military truck Lual was travelling in was going for a mission in Aweil.
Tokriic explains that they have identified a person as civilian and that olice officers are investigating the incidence.
The victim is now admitted in Tonj Civil Hospital for the treatment.
Radio Don Bosco could not reach police officer for comment.