Overview
- Building environmental systems flagged an air-quality problem, prompting Pentagon security to activate standard protection protocols.
- Multiple interior areas were closed off, with unnamed sources saying floors two through five in corridors four through seven were sealed.
- Security staff inside the building were observed wearing gas masks and full chemical-protective gear during the response.
- A hazardous-materials team deployed to the scene is conducting tests and Arlington County Fire and Rescue is providing support.
- An internal Pentagon message said additional testing could take one to two hours and officials have not yet identified the substance so the situation remains under active assessment.