JUBA, South Sudan (AP) — Lawyers for the family of slain American-British journalist Christopher Allen are urging South Sudan's government to investigate his death as a potential war crime, two years after he was killed.

The 26-year-old freelancer died on August 26, 2017, during an opposition-led offensive in the town of Kaya along the Ugandan border while embedded with the rebels. He's the only international journalist to be killed in South Sudan.

Caoilfhionn Gallagher, a lawyer in London who leads the legal team for the Allen family told The Associated Press that there are reasonable grounds to suspect that both the killing of Christopher Allen and the treatment of his body after death constitute war crimes committed by members of the South Sudanese armed forces.