A formal investigation conducted by the U.S. military has determined that there was no release of white phosphorus at Osan Air Base in Pyeongtaek, South Korea. The incident, which took place in late July, initially triggered a public safety response from local officials. On July 28, authorities in Pyeongtaek issued an emergency alert advising residents living in the immediate vicinity of the base to evacuate as a precautionary measure against a suspected chemical leak.

While the Pentagon’s findings explicitly state that no white phosphorus was leaked, the report serves as a resolution to the brief period of uncertainty that prompted the local government's intervention. The evacuation order was lifted shortly after the situation was assessed. The military's investigation into the event has now officially concluded, effectively dismissing the initial reports of a hazardous chemical release that had caused concern among the local population near the facility.