South Korean authorities ordered a temporary evacuation on Tuesday following a suspected leak of white phosphorus at a U.S. military installation near Seoul. The chemical, commonly used in incendiary munitions and smoke shells, poses significant hazards due to its ability to ignite at high temperatures, potentially causing severe burns and fires.

The incident occurred at a base operated by the U.S. 51st Fighter Wing, which promptly established a 300-meter safety cordon around the affected area as a precautionary measure. The restriction was implemented after experts conducting a routine inspection discovered crystallized white phosphorus residue inside a munitions crate.

Emergency responders quickly addressed the situation, and officials confirmed that no injuries were reported. After mitigation efforts, the safety cordon was lifted, allowing the base to resume normal operations. Authorities did not provide further details regarding the source of the leak or the volume of the chemical involved.

The compounds used in white phosphorus munitions are known for their incendiary properties and can be hazardous to both personnel and nearby structures if not properly contained. This event highlights the ongoing risks associated with the storage and handling of such materials on military sites.