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White phosphorus leaks at US air base in South Korea, Seoul says

By Thomson Reuters Jul 28, 2026 | 4:24 AM

SEOUL, July 28 (Reuters) – South Korean authorities ordered brief neighbourhood evacuations on Tuesday after a leak of white ​phosphorus inside the U.S. Osan ‌Air Base south of Seoul, the Safety Ministry said.

No casualties were reported and the evacuation notice for residents was lifted after about half ‌an ​hour, 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 spokesperson for the air base said there ⁠was a munitions-related accident and it was assessing the situation, in response to a request ⁠to confirm ‌the nature of the leak.

White ⁠phosphorus is a highly toxic ​substance ‌that can ignite on contact ​with air ⁠and is used in battlefield smoke screens and incendiary weapons.

(Reporting by Jack Kim, Hyeyoon Cho and Jihoon Lee; Editing by Ed Davies, Andrew Heavens, Kevin Liffey and ​Hugh Lawson)