US Military Rules Out White Phosphorus Leak at South Korea Base Amid Protests

A US military investigation has confirmed that there was no white phosphorus leak at the Osan Air Base in Pyeongtaek, South Korea, resolving concerns from a July 28 incident that prompted local evacuation alerts. The suspected chemical residue was identified as non-hazardous surface corrosion from environmental exposure. The announcement follows a separate incident on August 4, where eight South Korean progressive students were detained for breaking into the same base to protest US military opposition to a local semiconductor cluster project.

// Background

The United States stations approximately 28,500 troops in South Korea to deter North Korean aggression, a presence originating from the 1950-53 Korean War. While the bilateral alliance enjoys majority public support, the US military presence has historically sparked anti-American sentiments and protests. This includes a 2019 incident where progressive students breached the US ambassador's residence in Seoul to protest defense cost-sharing demands.

// Key Developments

• The US military confirmed that residue found during a routine munitions inspection at Osan Air Base was non-hazardous surface corrosion, not white phosphorus.
• On July 28, Pyeongtaek city officials briefly urged residents to evacuate and avoid skin exposure due to the suspected leak before lifting the alert later that day.
• On August 4, eight South Korean students were detained for unlawfully entering Osan Air Base while shouting anti-US slogans.
• The Korean Progressive University Student Union claimed the break-in was a protest against US opposition to a South Korean semiconductor cluster project.
• No injuries were reported from either the suspected chemical incident or the security breach.