Overview
- U.S. 51st Fighter Wing personnel found crystalline white phosphorus residue inside a munitions crate during a routine inspection on Tuesday, triggering an ordnance response.
- Explosive ordnance disposal teams, firefighters and police set up a 300–500 meter safety cordon and Pyeongtaek issued a brief evacuation alert that was lifted after decontamination.
- The 51st Fighter Wing says the material was secured, no injuries occurred and normal operations have resumed, but it did not disclose the amount of substance involved.
- South Korean officials are negotiating entry access to Osan so government teams can conduct air quality and environmental checks, and opposition politicians have demanded a fuller incident accounting.
- Some local reports said the material was about 80% diluted, a figure the wing has not confirmed, and experts warn white phosphorus can ignite on air exposure and cause severe burns or toxic fumes, which fuels public concern and scrutiny.