White phosphorus leak prompts brief evacuation near Osan

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1–2 minutes

Summary

A white phosphorus leak at Osan Air Base led to brief evacuations, with no casualties reported.

Why this matters

The incident affected communities near a major U.S. military base in South Korea and involved a toxic substance used in munitions. It also highlights the need for rapid emergency coordination between South Korean and U.S. authorities.

South Korean authorities ordered brief neighborhood evacuations Tuesday after a white phosphorus leak inside Osan Air Base, a U.S. base south of Seoul, the Safety Ministry said.

No casualties were reported. The evacuation notice was lifted after about 30 minutes as South Korean fire authorities and U.S. forces carried out decontamination work, Yonhap News Agency reported.

“At 1708 (0808 GMT), due to a ground mishap and out of an abundance of caution, Osan AB (Air Base) established a 1,000-foot safety cordon to protect base and local populace,” the base said in a statement.

“Our emergency response professionals are currently managing an isolated situation on the installation. We are handling this matter with the utmost care and expediency.”

A base spokesperson said there was a munitions-related accident and that officials were assessing the situation.

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