Based on my research, I can verify this claim:

Reasoning:

• A UN Commission on Human Rights in South Sudan report documents that joint aerial bombardments by South Sudan and Uganda used "improvised incendiary devices" that inflicted severe burns on civilian victims¹²
• The report describes attacks where "barrels of liquid that ignited" were dropped on homes, engulfing them in flames²
• Witnesses told the UN commission they saw "civilians set alight, including a boy burnt beyond recognition" during a March 2025 attack in Wunaliet²
• The airstrikes targeted civilian-populated areas predominantly affecting Nuer communities in opposition-affiliated areas²
• Human Rights Watch corroborates these findings, documenting that improvised incendiary weapons killed dozens and left survivors with severe burn injuries³
• The UN report was presented at the UN Human Rights Council in Geneva and draws on independent investigations conducted in South Sudan focused on events in 2025¹

Overall validity: 95%

1. UN inquiry finds South Sudan's political and military ...
2. Uganda and South Sudan airstrikes killed civilians, UN report reveals
3. South Sudan: Incendiary Bombs Kill, Burn Civilians