Pentagon on lockdown, HAZMAT crews rush in over ‘hazardous materials incident’

The Pentagon, which houses the US Department of War, has been placed on lockdown today, June 11, as emergency workers respond to the Department of War’s headquarters for a “hazardous materials incident,” Arlington County Fire and EMS said in a post on X. 

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“ACFD units, including our Hazardous Materials Team, are currently operating at the Pentagon in support of PFPA’s Hazmat Team during a hazardous materials incident,” it said. 

Building systems detected an “air quality issue,” which prompted a shelter-in-place order, Pentagon spokesman Sean Parnell said in a statement. 

“The Pentagon has sophisticated systems to ensure the safety of the building and its occupants,” Parnell said. 

“Those systems have detected an air quality issue necessitating precautionary measures until we determine its significance.” 

“The Department is executing standard protection protocols, including a shelter-in-place order for the affected area. Response teams are in place and ready to support building occupants,” he added. 

The Pentagon is one of the most secure structures in the United States of America.  It has an impressive, building-wide defense system that can stop air flow between corridors, detect hazardous materials floating in the air and seal off parts of the building to stop contaminants from spreading.

The Pentagon’s unique design — five rings connected by corridors — makes it possible to divide the building into multiple ventilation zones, allowing officials to lock down affected areas without evacuating all of it approximately 26,000 workers.

While officials say investigators are working to discover exactly what triggered the alarm, the Pentagon has spent years developing a highly advanced airborne threat detection and containment system known as Pentagon Shield, according to public documents. 

The program was launched after the 9/11 terror attacks to protect the nation’s largest government office building chemical, biological and radiological threats. 

The system uses a network of sensors and computer modeling tools to detect dangerous substances and track how they move around the five-sided headquarters, according to a technical paper on the Pentagon Shield. 

“Building ventilation systems can be adjusted in real time to minimize air infiltration,” researchers wrote in a 2007 overview of the program. 

If a hazardous substance is detected, the Pentagon can alter airflow throughout the building, isolating sections and reducing the risk that contaminants spread from one corridor to another.