The Pentagon lockdown and evacuation was due to a false alarm, according to sources. Multiple floors and corridors inside the building had been locked down and others were evacuated due to a reported hazardous materials incident.

Incident Response

Pentagon spokesman Sean Parnell stated that systems within the Pentagon had detected an air quality issue, necessitating precautionary measures until the significance of the issue could be determined. The Department executed standard protection protocols, including a shelter-in-place order for the affected area.

The Pentagon Force Protection Agency’s hazardous materials response team responded to the incident with the assistance of the Arlington County Fire Department. A post on social media from the Arlington Fire & EMS said the Arlington County Fire Department Hazardous Materials Team were operating at the Pentagon during a hazardous materials incident.

Floors two through five in corridors four through seven of the sprawling Pentagon complex were locked down, according to sources. Police in the building wore gas masks and full chemical protective gear.

Original reporting: KTVZ (Central Oregon) — read the source article.