Pentagon lockdown triggered by air quality detection in Arlington facility
Pentagon lockdown in Arlington triggered by detected air quality concern; hazmat teams responded.
Event / Security
Pentagon Hazardous Materials Incident
Pentagon lockdown on June 11, 2026 due to air quality issue detected in floors 2-5, corridors 4-7. Pentagon Force Protection Agency and Arlington County Fire Department responded. Testing estimated at 1-2 hours with no injuries reported.
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2026-08-16 to 2026-11-13 · UTC publication dates
Coverage begins 12 Jun, 00:07 UTC
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What happened
Pentagon lockdown and evacuation triggered by detected air quality issue
Multiple floors and corridors inside the Pentagon were locked down and evacuated due to a detected air quality issue classified as a hazardous materials incident. Pentagon spokesman Sean Parnell confirmed that systems within the Pentagon detected an air quality issue necessitating precautionary measures. The Department executed standard protection protocols, including a shelter-in-place order for the affected area.
Pentagon Force Protection Agency and Arlington County Fire Department respond to hazmat incident
The Pentagon Force Protection Agency's hazardous materials response team responded to the incident with assistance from the Arlington County Fire Department. Response testing was estimated to take one to two hours. No injuries were reported at the time of the incident.
Floors 2-5 in corridors 4-7 of Pentagon locked down during incident
Floors two through five in corridors four through seven of the Pentagon complex were locked down during the hazardous materials incident response. Personnel responding to the incident, including police in the building, wore gas masks and full chemical protective gear.
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