Overview
- Sensors inside the Pentagon detected an air-quality anomaly, prompting precautionary protection protocols and a shelter-in-place Thursday for affected corridors and floors.
- The Pentagon Force Protection Agency led the response while Arlington County Fire & EMS deployed its Hazardous Materials Team to support on-scene testing and containment.
- Responders in gas masks and full chemical protective gear inspected and tested air in locked-down areas, which included floors two through five in corridors four through seven.
- Officials announced that subsequent targeted testing found no hazardous substance, the shelter-in-place was lifted, and normal operations resumed later the same day.
- The incident highlights the Pentagon’s automated detection and ventilation zoning systems, which let teams isolate parts of the building quickly and protect thousands of employees during an alert.