A letter reviewed by The Washington Post says a Sudanese chemical storage site was cleared of traces and residue tied to the country's alleged chemical program.
The document does not say when the site was emptied or who removed the residue, leaving a key gap over whether the clearance happened before or during Sudan's war.
The disclosure adds to reports alleging a secret chemical weapons program, including documents said to link program figure Tarig Madani to Abdel Fattah al-Burhan.
With fighting limiting access to suspected facilities, the cleared site sharpens questions over the program's scale, other storage locations and what happened to related materials.